Much depends on your arrival and departure times but you might look into Blue Angel. It has a nice vibe and is fairly close to cruise ship pier, meaning a fairly inexpensive cab ride. I think they have a boat that goes out around 10 a.m. No beach to speak of but right on the ocean, a pool, chairs, a nice restaurant. Another possibility is the Money Bar, also not too far south and which has a very nice beach, chairs, and a decent restaurant. I am pretty sure I have seen DMs taking divers out there for shore dives (I was mostly making like an iguana with my eyes half-closed), but I have no idea which op was working from there or whether there was much to be seen once underwater. It is possible they were just doing check out dives. Maybe someone else here knows what the story is there.