Regarded as the Gulf of Thailand’s best diving site, Koh Tao is ringed by verdant coral reefs having colourful fish. Owing to excellent underwater visibility, snorkelling tours allow one to see tropical fish, turtles, and black tip sharks up close at Freedom Bay, Shark Bay, Aow Leuk Bay and Tao Thong Bay. Snorkelling equipment and guides are available starting at THB 3,000 at Koh Tao’s many PADI-certified diving schools and shops.