Thailand's Islands: Koh Samui, Koh Tao & the Gulf Coast
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Thailand has two island coasts: the Andaman Sea (west — Phuket, Krabi, Koh Lanta, the Similans) and the Gulf of Thailand (east — Koh Samui, Koh Phangan, Koh Tao). The Gulf coast is accessed from Chumphon or Surat Thani (3.5–7 hours from Bangkok by train or bus, or 1 hour by domestic flight). The two coasts have different monsoon seasons — when the Andaman is rough (May–October), the Gulf is calm, and vice versa.
The three islands of the Gulf’s inner archipelago form a logical progression: Samui for infrastructure, Phangan for atmosphere, Tao for diving.
Koh Samui
The most developed of the three Gulf islands — Chaweng Beach has the infrastructure of a mid-size resort town, with international hotel chains, shopping malls, and a functioning hospital. The beaches on the north and northwest coast (Bophut, Mae Nam, Bangrak) are calmer and more village-scale.
Chaweng Beach: The main strip — 7 km of white sand, calm water in the high season (December–February), and nonstop development behind it. The beach is still attractive; the road behind it is undifferentiated resort infrastructure.
Bophut Fisherman’s Village: The most characterful neighborhood on Samui — a preserved Sino-Thai fishing village with wooden shophouses converted to boutique hotels, seafood restaurants, and the Fisherman’s Village Walking Street (Friday evenings). The beach here is quieter and shallower than Chaweng.
Big Buddha (Wat Phra Yai): A 12-meter gilded seated Buddha on a small island connected to the northeast coast by a causeway — more pilgrimage site than tourist attraction; the coconut stalls outside are a better experience than the climb.
Ang Thong Marine National Park: A 42-island archipelago 31 km northwest of Samui — the model for the fictional island in The Beach. Day trips by speedboat or catamaran include snorkeling, kayaking into cave systems, and hiking to the viewpoint over the internal saltwater lake (Talay Nai) on Koh Mae Ko. Tours from Samui from ฿1,200.
Koh Phangan
15 km north of Samui (40-minute ferry) — known primarily for the Full Moon Party (Haad Rin beach, monthly on the full moon, 20,000–30,000 people), but genuinely interesting beyond it.
Haad Rin: The Full Moon Party beach — functional but undistinguished outside of party nights. The peninsula it occupies has beaches on both sides; Haad Rin Nok (the party beach) is the main event.
The rest of the island: The west coast (Haad Yao, Haad Salad) has calm water and reef snorkeling. The interior is mountainous and largely undeveloped. The north coast (Chaloklum) is a working fishing village with the best seafood on the island. Thong Nai Pan Noi and Yai (northeast) are remote, beautiful, and accessible by a rough inland road that keeps them less crowded.
Koh Ma: A small island connected to the northwest coast by a sandbar at low tide — the snorkeling around the sandbar and the nearby reef is the best on Phangan.
Koh Tao
40 km north of Phangan (2.5-hour ferry from Samui, 1.5-hour speedboat) — the smallest of the three islands, and the most single-mindedly focused on diving. Koh Tao issues more PADI Open Water certificates than anywhere in the world; the number of dive shops per square kilometer is startling.
Diving: The sites around Koh Tao are accessible for beginners and rewarding for experienced divers. Chumphon Pinnacle (northwest of the island, 25–40 m) has the best chance of whale shark sightings. Sail Rock (between Tao and Phangan) is the most iconic site — a 20-meter rock column with a vertical chimney swim-through and typically clear visibility.
Open Water certification: 3–4 days, including pool training and 4 open-water dives, available at dozens of dive schools for ฿9,500–12,000 (including accommodation at the dive school’s partner guesthouse). Quality varies — look for PADI 5-Star dive centers.
Snorkeling: Japanese Gardens (northeast Tao), Twins (off the west coast), Mango Bay — all accessible without diving certification. Longtail boat rentals (฿1,500/day) for independent island circumnavigation.
Getting Around the Gulf Islands
Surat Thani: The mainland gateway — 8-hour overnight sleeper train from Bangkok (฿500–1,000) or 1-hour flight. Ferry services from Surat Thani port to Samui (2.5 hours), with connections to Phangan and Tao.
Don Sak Pier (80 km from Surat Thani): The faster car ferry departure point for Samui (1.5 hours).
Inter-island ferries: Samui–Phangan: 40 minutes by express boat. Phangan–Tao: 1.5 hours. Multiple daily departures from each island’s main pier.
Practical Notes
- Best time (Gulf islands): December–April (northeast monsoon has passed; Gulf is calm). July–September is the Gulf’s secondary dry season. The October–November transitional period can have storms
- Accommodation: Samui has international resort chains; Phangan and Tao are primarily bungalows and guesthouses at ฿400–1,500/night, with a growing number of boutique resorts
- Diving season: Year-round; visibility best February–April and September–October
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