Complete Guide to Ko Chang & Eastern Seaboard (2025)

Ko Chang Thailand Scaled

The Eastern Seaboard is home to two of Thailand's most popular islands: Ko Samet and Ko Chang, both offering their own unique attractions. While these islands are the main draw, the mainland also boasts plenty of appeal, from the lively international resort of Pattaya to the charming, old-world character of Chanthaburi.

Ko Samet, the closest major island to Bangkok, is a favorite for flashpackers who enjoy sipping from vodka buckets while watching fire jugglers on the beach, or retreating to its quieter southern coves for a more relaxed vibe. A little further down the coast, Ko Chang, Thailand's second-largest island, offers a more diverse experience. You can spend your days diving in crystal-clear waters, relaxing on the west coast's sandy beaches, or hiking through lush jungle trails, then unwind in time to enjoy the island's lively party scene.

While fewer tourists visit Bang Saen, this coastal town has its own charm with hip beachfront restaurants and a long, quiet beach perfect for a leisurely stopover. Then there's Pattaya, a raucous resort town known for its vibrant nightlife, countless attractions, and some of the best international cuisine in Thailand. The Eastern Seaboard is a destination that blends tropical island relaxation with the excitement of urban getaways, offering something for every type of traveler.

Region map of Ko Chang & Eastern Seaboard

Cities of Ko Chang & Eastern Seaboard

Ko Samet

Complete Guide To Ko Samet Scaled

Ko Samet is a popular island destination located just a few hours from Bangkok, known for its beautiful beaches, crystal-clear waters, and vibrant nightlife. It offers a perfect escape from the hustle and bustle of the city, making it an ideal spot for a quick getaway. The island is home to several pristine beaches, such as Ao Prao and Sai Kaew Beach, which are great for swimming, sunbathing, or enjoying water sports like kayaking and snorkeling. The calm, turquoise waters and soft white sand make it an excellent location for those seeking relaxation and tranquility.

In addition to its stunning beaches, Ko Samet also offers opportunities for hiking, exploring nature trails, and watching breathtaking sunsets. The island is known for its laid-back atmosphere, making it a great place for both couples and families. In the evenings, the island comes to life with a variety of beach bars and restaurants where visitors can enjoy delicious seafood and tropical cocktails while listening to live music or watching fire shows. Whether you’re looking for adventure or relaxation, Ko Samet is a charming island that caters to all types of travelers.

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Pattaya

Pattaya

Pattaya, a vibrant coastal city on the Gulf of Thailand, is a favorite destination for travelers seeking a mix of relaxation and excitement. Known for its lively beaches, visitors can indulge in water sports, sunbathe on the golden sands, or simply enjoy a refreshing drink by the shore. Beachfront areas like Jomtien Beach offer a more laid-back atmosphere, while Pattaya Beach is bustling with activity. For a panoramic view of the city and sea, head to the Pattaya Viewpoint on Pratumnak Hill.

Beyond the beaches, Pattaya offers diverse attractions for every interest. Adventure seekers can visit Ramayana Water Park or Nong Nooch Tropical Botanical Garden, while culture enthusiasts will appreciate the intricate Sanctuary of Truth. The city also boasts a lively nightlife scene, with everything from beachside bars to bustling walking streets. With its unique mix of attractions, Pattaya promises an unforgettable experience for solo travelers, couples, and families alike.

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Chanthaburi

Christ Church Chanthaburi

Chanthaburi, a charming city on Thailand’s southeastern coast, is known for its rich natural beauty and vibrant cultural mix. The city offers visitors a peaceful escape with its lush landscapes, picturesque waterfalls, and serene rivers. One of the highlights is the nearby Chanthaburi River, which is perfect for boat rides or a leisurely walk along its scenic banks. The town is also famous for its fruit orchards, with visitors enjoying seasonal fruits like durian, rambutan, and mangosteen. Chanthaburi’s old town, with its mix of Thai, Chinese, and French colonial architecture, adds a distinctive charm to the experience, and the bustling Chanthaburi Gem Market is a must-see for those interested in precious stones.

For nature enthusiasts, Namtok Phlio National Park is a popular destination, featuring hiking trails, waterfalls, and opportunities to spot local wildlife. If you’re seeking a more relaxed experience, visit the pristine Chao Lao Beach, which is quieter than Thailand’s more famous beach resorts but offers clear waters and stunning views. Khao Khitchakut National Park, known for its famous pilgrimage site, is another highlight for travelers seeking to enjoy the area’s natural beauty and serene atmosphere. Whether you’re exploring cultural gems, indulging in delicious local fruit, or hiking through national parks, Chanthaburi offers a delightful and unhurried experience.

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Ko Chang

Ko Chang Thailand Scaled

Ko Chang is a beautiful island located in the Gulf of Thailand, known for its stunning beaches, crystal-clear waters, and lush jungles. Visitors to Ko Chang can enjoy a variety of outdoor activities, from lounging on the peaceful beaches of White Sand Beach and Klong Prao Beach to exploring the island’s dense rainforests and waterfalls like Klong Plu and Than Mayom. Whether you prefer water sports such as snorkeling, scuba diving, or kayaking, or enjoy more relaxed activities like hiking and wildlife watching, Ko Chang offers something for every type of traveler.

For those looking for a laid-back escape, the island also has plenty of restaurants, cafes, and beach bars offering fresh seafood and local dishes. The vibrant nightlife on Ko Chang provides a mix of relaxed beach bars and lively nightclubs. The combination of natural beauty, outdoor adventures, and relaxed atmosphere makes Ko Chang an ideal destination for both adventure seekers and those looking to unwind in paradise.

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Ko Si Chang

Phra Chudathut Palace
CC BY-SA 4.0 / Phra Chudathut Palace

Ko Si Chang is a serene and peaceful island located just a short boat ride from the mainland of Chonburi Province. Known for its natural beauty, the island offers visitors a perfect getaway from the hustle and bustle of city life. With its crystal-clear waters, lush greenery, and picturesque beaches, Ko Si Chang is ideal for relaxation and outdoor activities like swimming, kayaking, and fishing. The island’s laid-back atmosphere makes it a great destination for those looking to unwind and enjoy nature.

In addition to its stunning landscapes, Ko Si Chang also offers unique cultural experiences. Visitors can explore the island’s local markets, try fresh seafood at waterfront restaurants, and enjoy panoramic views from its hilltop viewpoints. Whether you’re strolling through the peaceful streets of the island’s small town or exploring hidden coves and beaches, Ko Si Chang provides a refreshing and tranquil escape for all types of travelers.

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History of Ko Chang & Eastern Seaboard

Prehistoric Times in Ko Chang & Eastern Seaboard

The history of Ko Chang & Eastern Seaboard begins in prehistoric times, with archaeological evidence pointing to early human settlements along river basins and coastal areas. Tools, pottery, and burial sites discovered in provinces such as Chanthaburi and Trat suggest that communities thrived here thousands of years ago. These early inhabitants relied on fishing, farming, and trade with nearby regions.

Ko Chang & Eastern Seaboard in the Early Kingdoms

During the Dvaravati and Khmer periods, the Eastern Seaboard came under the influence of major regional powers. The Khmer Empire extended its reach into the area, leaving behind religious and architectural traces, particularly in the form of stone ruins and sanctuaries. The strategic location of the region made it a point of contact for maritime trade and cultural exchange across the Gulf of Thailand.

Ko Chang & Eastern Seaboard in the Ayutthaya Period

Under the Ayutthaya Kingdom (1350–1767), the Ko Chang & Eastern Seaboard region played a growing role in coastal defense and resource supply. The area's forests and waterways were important for timber, trade, and shipbuilding. As Ayutthaya expanded its influence, eastern ports and islands served as anchor points for controlling maritime routes and monitoring foreign activity in the gulf.

Ko Chang & Eastern Seaboard in the Thonburi and Early Rattanakosin Period

Following the fall of Ayutthaya, the Thonburi and early Rattanakosin periods marked increased military significance for the region. Ko Chang in particular became a site of historical importance during the Franco-Siamese conflicts. In the late 19th century, a naval battle between Siamese and French forces took place off Ko Chang's coast, leaving a lasting legacy in national memory.

Ko Chang & Eastern Seaboard in the 20th Century

Throughout the 20th century, the region developed slowly compared to central Thailand. Fishing and agriculture remained dominant, while coastal towns served as trade and transit points. The post-war years saw gradual improvements in infrastructure and connectivity. Ko Chang began to gain recognition as a remote island escape, drawing Thai visitors long before it was discovered by international tourists.

Contemporary Ko Chang & Eastern Seaboard

In recent decades, Ko Chang & Eastern Seaboard has undergone major transformation. Tourism has become a driving force, with Ko Chang evolving into a major island destination. Meanwhile, mainland areas like Rayong and Chonburi have become industrial and economic centers, particularly due to the Eastern Economic Corridor initiative. Despite modernization, the region maintains strong ties to its maritime roots, natural landscapes, and multi-ethnic cultural influences.

Best Time to Visit Ko Chang & Eastern Seaboard

Visiting Ko Chang & Eastern Seaboard in Spring

Spring (March to May) in Ko Chang & Eastern Seaboard brings warm and increasingly humid conditions. March temperatures average around 30°C during the day and 25°C at night. By May, temperatures often climb to 33°C with higher humidity and occasional early monsoon rains. This season is sunny and suitable for beach activities and boat trips, though it can feel hot inland.

Visiting Ko Chang & Eastern Seaboard in Summer

Summer (June to August) marks the monsoon season in Ko Chang & Eastern Seaboard. Temperatures stay consistent between 28°C and 31°C, but rainfall increases significantly. Sudden tropical showers are frequent, especially in the afternoon or evening. While the landscape turns lush and green, sea conditions can be rough, and some ferry schedules may be affected by weather.

Visiting Ko Chang & Eastern Seaboard in Autumn

Autumn (September to November) sees the gradual retreat of the monsoon. September remains rainy, with average temperatures around 29°C, while October and November become drier and more pleasant. By November, daytime highs stay near 30°C with reduced humidity, making it a good time to enjoy nature hikes, waterfalls, and improving beach conditions.

Visiting Ko Chang & Eastern Seaboard in Winter

Winter (December to February) is the best time weather-wise in Ko Chang & Eastern Seaboard. Temperatures are comfortable, ranging from 28°C during the day to 22°C at night. Rainfall is minimal, and skies are typically clear, offering ideal conditions for snorkeling, diving, island hopping, and outdoor excursions. Coastal breezes also help moderate the warmth.

Annual Weather Overview

  • January 29°C
  • February 30°C
  • March 29°C
  • April 31°C
  • May 30°C
  • June 28°C
  • July 28°C
  • August 28°C
  • September 28°C
  • October 28°C
  • November 28°C
  • December 28°C

How to get to Ko Chang & Eastern Seaboard

Getting to Ko Chang & Eastern Seaboard by Air

Ko Chang & Eastern Seaboard is accessible via regional airports offering domestic flights from major Thai cities. The nearest airport to Ko Chang provides a convenient gateway for travelers flying in from Bangkok or Chiang Mai, with short flight durations. For those heading to industrial zones or beach destinations along the mainland coast, nearby airports in the region also serve both business and leisure travel.

Getting to Ko Chang & Eastern Seaboard by Train

While train service does not reach the islands, the Eastern Seaboard is connected to the national rail network. Trains departing from Bangkok travel to major railway stations in the region, offering a scenic and affordable way to reach coastal provinces. From train terminals, travelers can transfer to buses, vans, or private transport for onward journeys to the islands or industrial zones.

Getting to Ko Chang & Eastern Seaboard by Car

Driving to Ko Chang & Eastern Seaboard is a popular option, with highways linking the region directly to Bangkok and central Thailand. Well-maintained roads lead through rural and coastal areas, offering access to ferry piers, beaches, and business zones. Travel times vary depending on the starting point, but the region is reachable within a few hours by car, especially with the expansion of expressways.

Getting to Ko Chang & Eastern Seaboard by Bus

Numerous bus companies and minivan services operate routes between Bangkok and the Eastern Seaboard, including connections to ferry terminals for island access. Buses range from standard to VIP class, providing comfortable and economical travel options. Daily departures from major terminals ensure consistent availability, and connections are typically coordinated with ferry schedules for island transfers.

Festivals in Ko Chang & Eastern Seaboard

Songkran Festival
When: April
Where: Ko Chang
The Thai New Year, known as Songkran, is celebrated with nationwide water fights and cultural festivities. On Ko Chang, locals and tourists engage in friendly water battles along the beaches and streets, accompanied by traditional music and dance performances.

Loy Krathong Festival
When: November
Where: Ko Chang
Loy Krathong, the “Festival of Lights,” involves releasing decorated floating baskets (krathongs) onto waterways to honor the water goddess and symbolize the letting go of negativity. On Ko Chang, participants gather at beaches and rivers to set their illuminated krathongs afloat, creating a mesmerizing spectacle.

Ko Chang Music Festival
When: November
Where: Ko Chang
A vibrant music festival featuring performances by local and international artists across various genres. Attendees can enjoy live music, beach parties, and cultural activities in a picturesque island setting.

Asanha Bucha Day
When: July
Where: Nationwide, including Ko Chang
A significant Buddhist festival commemorating Buddha’s first sermon. Observances include temple ceremonies, candlelit processions, and merit-making activities.

Makha Bucha Day
When: February
Where: Nationwide, including Ko Chang
A Buddhist festival marking the Buddha’s teaching of Ovada Patimokkha. Celebrated with temple visits, merit-making, and evening candlelit processions.

Chinese New Year
When: January or February
Where: Areas with Chinese communities, including parts of the Eastern Seaboard
Celebrations include dragon and lion dances, fireworks, and traditional Chinese performances.

Pattaya Music Festival
When: March
Where: Pattaya
A major music event featuring performances by Thai and international artists across various genres, held on multiple stages along Pattaya Beach.

National Elephant Day
When: March 13
Where: Nationwide, including areas in the Eastern Seaboard
A day dedicated to honoring Thailand’s national animal, featuring special events at elephant sanctuaries and parks.

Rocket Festival (Bun Bang Fai)
When: May
Where: Northeastern Thailand, but celebrated in various regions
A traditional festival involving the launching of homemade rockets to encourage rainfall, accompanied by music and dance.