We were staying at the Grand Hyatt next door. Wondering what that impressive was, we took a stroll to check it out. It is a 7 star resort hotel in its opening phase. Impressive all over.
Three restaurants, a traditional Chinese, a Thai and a Western style. We visited the Western restaurant and the food was superb. Prices are on the higher side, but fair.
We would choose this hotel whenever we come back to Sanya.

Spent there few months. Staff are friendly, food is good, the views are amazing. Since the hotel is new though, there is a lot of smell from construction. Nevertheless though, having a glass of wine in the bathtub on the balcony while watching the sea view is unbeatable.