Thailand
Both Phi-Phi Don and Phi-Phi Ley deserve the reputation they have for stunning beauty. However they have been taken over somewhat by twentysomethings drinking alcohol out of a bucket and wanting to get laid. If that is what you are looking for, this is the place for you! If this is not what you are looking for and you are not twenty anymore it is quite off putting, but the islands are stunning and they are worth the trip. Particularly beautiful is nearby Bamboo island which you can stay on, is simply stunning and very peaceful.
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