Banyan Bay Villas offer equipment for all skill levels (most of it new). The Managing Vice-President, Mr. David Childs, was key in introducing windsurfing to Ambergris Caye. He had a multi-page write up in Playboy magazine several years ago about his windsurfing school.
The winds are great in Feb.
You can't go wrong with Banyan Bay, I mention to most people that Banyan Bay is one of the nicest properties in the country.
Email Banyan Bay and ask for Mr. Child's input. He's very informative.
It is windy in Feb, not sure on the water temps.