I am talking about Phi-phi island, where the movie Beach filmed.

It is very close to phuket. It is a well know place for young backpacker. Most of european go there in summer break and live there 3 month to learn scuba diving. The guest house cost about $5/day, and food is very cheap also. They have the famous full moon party, i think once a month. We went there on July, and loved it so much and we are going back next month along with a stop in Cambodia.