Ken,
I'm going there in July and did a pprune search on this very subject yesterday. I'm just looking to get airborne with an instructor as I haven't finished my ppl yet.
I got the name of a flying school called Gardair, run by Derek Gardier, who is apparently a good chap. There were no contact details though, and the threads were from 2002, so the info may be out of date.
I get back on 3rd August, so I'll let you know more then if you're not already in Barbados.
Regards,
Dave