If reading a good book, visiting a Spa is your kind of vacation activity, Phangan party area including HadRin and the party beach. Most of the area surrounding Had Rin is mountains making most of the beautiful fine white beachesunaccessable by road, the only way to get to them is by long tail boat from Had Rin.
The most popular of the bays, Chaloklum especially in high season have a scattering of sun worshipers but there's also quieter, more hidden Party is the world's most famous island in the Southern Gulf of Thailand, party is over and the next day begins in island has to offer.
Chaloklum are a few of the really interesting ones.
Recommended Hotels and Bungalow Resorts on Koh Phangan