Go Man! Go when ever you have the chance. The atomosphere of being there steps you up another level. I try get there or send my guys when ever I can, and they come back charged, fit and ready for action. There is a lot of awesome gyms to train at! I sent my son to Fairtex for 2 weeks and his formed improved immensely, and then sent him to another one of our Brother gyms we go to every year "Sasiprapa in Bangkapi Bangkok" his first time there and he was treated so awesomely, he couldnt stop talking about it. We trained there last year for world champs with other clubs from around the world and the training was top notch, everyone runs then everyone trains. It was Awesome!
It also depends where in Thailand you go, there are good gyms everywhere, I am sure someone who has been there can giv you some good direction to a good one. Ko Samui, WMC Camp Samui at Lamai beach is a good one as well, a lot of the teams that complete in the Muay Thai World champs go train there. Awesome place wish I was there right now! Very cheap to stay its ridiculous.
Also keep in mind that if you go to party and train,,,its a bit of a waste of time. Either go there to Party,,,,or go there to train. You cant do both if you are serious about fighting, too many distractions.
Anyway good luck, hope ya get there soon.