i am giving my husband's opinion here. he chose not to do the blue hole, as it is a long ride for 8 minutes bottom time. he instead dove turneffee atoll, and it was his best dives ever. 2 dives, i think 45 ft, both with multiple dolphins. he said you hear "click click" and turn around and there they are. they dont touch you but swim all around you. then they followed the boat back. he said it was the dive of a lifetime.