How many days are you planning to spend for this trip?

There are a couple of properties that are not that accessible as compared to Sheraton Krabi or any resorts in Phuket, Pattaya, but they are equally impressive as well.

Sheraton Hua Hin and LM Khao Lak are two examples. Therefore time to travel to these resorts becomes a factor. Like the others have suggested, there are lots of threads here to assist you.

Which period are you arranging as well? It might matter.

Again, not speaking as a lurker this time and I have only been to Krabi which is relaxing and most important for me, away from crowded places.