Cat88L3

Hello everyone. I'm torn as to where to spend my last 4 nights in Thailand. This will be my first Thailand trip. On this trip, I would have stayed in Koh Samui (7 nights split between 2 sides of the island) and Koh Phagnan (3 nights) previously. I'm going solo in July. Yes, I know it's rainy season. July/Aug is the only time I can do extensive travel. This is why I'm spending more time on the Gulf of Thailand.

I have no desire to do any shopping or adventure related tours. The most I would do is a day trip to the Phi Phi islands.
I like upscale hotels and great/very good beaches are a must. I'm looking to just chill at the beach & have opportunities for mixing and mingling at cool bars.

Which area/hotel should stay at? My choices are Naithon Beach (Phuket-Pullman Arcadia Naithon), Makham Bay (Phuket-Pullman Phuket Panwa), or Khao Lak (Bang Niang Beach-La Vela Khao Lak) Thanks for your help and suggestions!