I went to Tiger Muay Thai and Dragon Muay Thai, both in the town of Chalong on the Island of Phuket. Tiger is the most commercial school in Thailand, and Dragon is smaller and more personal. That comes with pros and cons. Tiger (TMT) will focus on your fitness, with very effective endurance and strength training classes. Do crossfit and Muay Thai daily and your fitness will be off the charts. Dragon has smaller classes, so more one on one time, but it also has a lot less facilities. Just 1km away from the two camps, a new camp called Phuket Top Team has opened up. I haven't been there, but it's definitely worth taking a look because they spent an absolute cunt load getting it up and running, it looks really top notch. Tiger has good MMA and boxing facilities, as well as Yoga in the mornings, crossfit classes, strength classes as well as a shit load of other stuff.
If you want more info or have any more specific requests, don't hessitate to ask.