Koh Tao Travel Guide: Diving, Snorkelling, and Island Life

A guide to Koh Tao — Thailand's diving capital, with guides to dive schools, the best snorkelling spots, beaches, and how to get there.

Koh Tao at a glance

Koh Tao is a small island (21 sq km) in the Gulf of Thailand, about 70km north of Koh Samui. It has more dive schools per square kilometre than almost anywhere in the world and is consistently rated one of the best value places globally to get a PADI Open Water certification. Around 100,000 divers qualify here annually.

The island beyond its diving reputation is relatively compact — a main beach (Sairee), some quieter bays, a small amount of inland jungle, and a social scene centred on the dive shop community. It attracts a mix of people: some are here only to dive, some for the parties, some for the relatively affordable island living.

Diving

Koh Tao has around 25 dive sites within 30 minutes of the main pier, and another 15–20 sites within an hour. The variety covers everything from sheltered beginner reefs to deeper sites for advanced divers.

Chumphon Pinnacle — The top site for advanced divers. Granite pinnacles at 14–40 metres with schooling fish, whale sharks (seasonal), and strong currents.

Southwest Pinnacle — Another advanced site with good visibility and resident grouper and trevally.

Japanese Gardens — The best beginner and snorkel site. Shallow, clear, and high fish density between Koh Tao and the adjacent Koh Nang Yuan.

Shark Bay (Ao Leuk) — Blacktip reef sharks are reliably seen here. Accessible by snorkelling from shore.

HTMS Sattakut Wreck — A deliberately sunk navy vessel at 18–30 metres. Good for diver photos and marine life habitation.

Dive schools

Around 60 licensed schools operate on the island. All are PADI or SSI certified. The price difference between schools is small — choose based on instructor-to-student ratio (max 4:1 for Open Water is the standard), boat size, and whether they schedule night dives. Ban’s, Apnea Total, and Big Blue are long-established with strong reputations for beginner courses.

Beyond diving

Sairee Beach — The main beach, longest on the island. Coral sand, reasonably clear water, a strip of bars and restaurants behind. Gets crowded during Full Moon Party overflow.

Koh Nang Yuan — A tiny island 15 minutes by longtail from the main pier. Three connected islands with a classic viewpoint hike. Day trip by longtail: ฿100 return plus ฿100 island entrance fee.

Mango Bay — A sheltered cove on the north coast with good snorkelling. Accessible by scooter on the north coast road.

Practical information

Getting there — High-speed ferry from Koh Samui (1.5 hours, ฿400–500) or Koh Phangan (1 hour, ฿250). Night ferry from Surat Thani (6 hours, ฿500–600 including cabin bunk).

Getting around — Songthaews run between Sairee and Mae Haad pier. Rent a scooter for the rest of the island (฿200/day). Some parts of the west coast road require care on a scooter in the rain — steep sections.

Best time — February to September. October and November bring the northeast monsoon — diving may be cancelled on rough-weather days.