Half Moon Bay is so shallow that coral starts just a few feet off shore. You can even take overnight trips to Guatemala or Cuba. In Akumal, contact Akumal Travel Services. In other areas, please ask your property manager. Watch your restaurant check.
Tips are their income.
We generally recommend not relying on credit cards. Except for Playa del Carmen and Puerto Aventuras, many places cannot accept credit cards for lack of phone lines. At Puerto Aventuras. Reservations are recommended. Just about non-existent anywhere along the coast.