Thailand recommendations?

Hi,

I'm off traveling to Thailand for a month leaving next week and am
planning to build in 4-5 days of diving while i'm in the southern part
of the country. I'm looking for any recommendations on good
companies/schools to use and their location. I'm one of those warm
water holiday divers (PADI advanced level) who doesn't manage to dive
frequently, so i'm looking for somewhere with good organisation (to
counter my growing but not vast level of experience) and full kit for
hire.

Thanks!

Christian