For me, it has to be Railay beach near Ao Nang/Krabi in Thailand. It is just amazing!!

You have to take a boat to get to it, because of the massive limestone cliffs that seem to seclude it from the outside world. Once there you probably wouldn't want to leave for quite some time. Luckily there is ample accommodation available too, should you wish to stay for a while.

Make your way to the West of Railay once you're settled, and just enjoy the most relaxing, most beautiful beach you've ever been to! You can also take a tour to some of the other nearby islands like Chicken Island, or if you feel more adventurous, try climbing the limestone cliffs. All in all, it's worth a visit.