My wife and I went to Sanya for our honeymoon. Loved it. Pullman is awesome. Fantastic swimming pools, the breakfast is awesome, the dinner buffet was awesome and the rooms are great. Loved the whole place. The staff is very attentive and sweet. We really enjoyed our time in Sanya. The beaches are gorgeous. We went to Yalong bay, and some other awesome places. The local fruit and other food is insanely good! Do your homework on good restaurants and don't get ripped off. A great time can be had in Sanya, lovely place.
All of the Pullman food was quite exquisite, except on one night when we went to their Cantonese place. It was OK but very overpriced for the quality. WAY better stuff can be found off the beaten path. Do some hunting and find some of the truly spectacular places that are around. Also I suggest hitting up some of the cool history tours that are there.