Koh Tao: The Complete Island Guide

Koh Tao (Turtle Island) sits in the Gulf of Thailand between Koh Samui and the mainland, and its reputation rests almost entirely on one thing: scuba diving. The island has over 50 dive sites within easy reach, from the beginner-friendly shallow reefs of Mango Bay and Aow Leuk to advanced deep sites like Chumphon Pinnacle (where whale sharks are spotted regularly between March and September) and Southwest Pinnacle. PADI Open Water courses here cost ฿9,000–12,000 — among the cheapest in the world for internationally certified instruction — and the island hosts dozens of dive schools competing for business, which keeps standards high and prices competitive. Beyond diving, Koh Tao offers excellent snorkelling at Japanese Garden reef (free, accessible by kayak from many resorts), the shark-shaped silhouette of Shark Island, and rocky hiking trails to the summit of the island's central hill for panoramic views. The main village of Mae Haad has a good selection of restaurants, bars, and accommodation, while Sairee Beach on the west coast is the social hub with beachfront bars and a lively backpacker scene. Getting here requires a ferry or speedboat from Chumphon (2 hours) or Koh Samui (1.5 hours).