My wife and I snorkeled Black Rock amongst the mass of people and decided we needed a better way to see the area, so we rented tanks. If you get them at the Sheraton it is a pain, plus more expensive. We rented from Pacific Divers in Lahaina. Their 24 hour rental was cheap. The dive was pretty good. Very easy to access the water and it isn't a far swim. Multiple turtles, lots of reef fish, eels, and the coral is great color. Well worth the time.