Phi Phi Islands (Koh Phi Phi)

Worth it for 18-35s who want iconic limestone scenery and decent snorkelling without breaking the bank, since the islands themselves are free to explore once you're there. The 4.7 rating across nearly 18k reviews suggests most people have a solid time, though you'll want to book a tour operator carefully from the 267 options available—that many choices means quality varies, so read recent reviews before committing your money.

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