
Re: Muay Thai & Teaching English (TEFL) in Thailand?
www.ajarn.com is probably the best site for TEFL advice.
Re muay thai, I'm sure there are schools/gyms on Phuket, but I've not been there for quite some time. I know there is one on Koh Lanta, but I doubt you can find any TEFL job on that island.
Muay thai doesn't intervene with playing guitar, but your partying and drinking have to be kept at a minimum if you are serious about your training.