Bahamas
Warm, clear water with decent life, and close dive sites. Diving in the Bahamas is easy and fun. There are a few wrecks, local reefs, and things are easy to access. The dive operators are plentiful but the prices aren't as cheap as you'll find in other Caribbean locations. I think this is because many of the cruise ships access the Bahamas (just my opinion).
I traveled to the Bahamas in July and dove with Bahama Divers at the following sites: James Bond Wreck, 5 Dollar Reef, and one more local site of Nassau. Our group only wore bathing suits as the water was warm enough for all the dives (80oF). We saw rays, turtles, lots of tropical fish, etc. My favorites are the parrot fish but I also enjoy seeing the angelfish, and drum fish.
Other things you can do in the area are go spend the day at the Atlantis Resort, rent ATVs and head into the hills.
Nassau is very touristy and you'll find all the beachy bars and restaurants, as well as all the shopping and resorts. A fun place for diving, eating and shopping.