One of my favorite dive sites is the Island of Dominica in the Southern Caribbean.  Many divers who I talk to, have not been there…..yet.  But the island is becoming better known because the cruise ships have found it.  The diving and snorkeling is great, and the undiscovered dive sites are very healthy.  There are 5 dive shops and the non-divers can go whale watching.  American Airlines has direct flights to Dominica or you can go through a travel agency such a Nature Island Destination.