I think many parts of Samui are awesome....I stayed with a friend at the Le Meridian Baan Taling Naam resort (I think its in the southwest part of the island) and it was sooo great

relaxing, so beautiful, private......infinity pool with gorgeous mountain scene backdrops, and private beach below.....just what the doctor ordered to unwind and recharge....
also took a boat to little Turtle Island (Koh Tao) for great snorkling and beaches.....
I'll also want to try the new Marriott (Renaissance) when its finished....