After three visits there, I would highly recommend Leinster Bay. NPS moorings (voluntary, you put you money in a box on a raft). Great snorkeling around Waterlemon Cay. (However, be careful of strong currents depending on tide and wind). The abandoned Annaberg sugar plantation is fascinating. When approaching by dinghy, do not go past the landing spot, as it gets very shallow (6"-12") very quickly.