There are lots of nice places on AC.
(you are talkin AC right?)
Anywho... you kinda need to tell folks more stuff of what you want....pool, kitchen, pampered, night life, bal bla...
TOTALLY PAMPERED and lots of $$ I would go to Caye Espanto. It's on the back side of the Island so diving may take a bit longer to get to. I'm really not sure though...I haven't dove in years and never have been to Espanto
(humm, I think I gotta have a talk with Dan about that! lol)
Gaz Cooper seems to have some great acc and dive packages, otherwise you could go to Victoria, Ramons, Caribe, pretty much anywhere and the dive boats pick you up on thier docks.
Hope this helps some.