I was there about one year and a half ago and stayed in Ao Prao. Really beautiful resort, very comfortable, and not really expensive, although I do not recall the exact price. Wonderful beach, but for more adventures, you have to got to Ao Sai Kieaw (about 20 minutes to walk along the jungle, but the road is absolutely OK, and in the night you can take a torch with you. Also jeeps available, but in my opinion too expensive.
It was a rother quiet holiday, but since I had a handsome student from Bangkok with me, I got a lot of fun