For unforgettable underwater theater, head to one of Thailand's top dive sites, where facilities range from beginner courses of a few hours to live-aboard boats that stay out several days. Koh Tao, in the Gulf of Thailand, is popular, but the best locations are the Similan and Surin islands, where you meet nomadic island-hopping people known as Sea Gypsies and swim with whale sharks, clownfish, and leatherback turtles.
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