Turtle Reef is one of the best dives on GC period.There is always a lot of marine life because of the nutrients. Navigation and entry/exit are easy. Going south on the dive, there is a cavern with 20-30 tarpon in it. Going North, a lovely mini wall with lots of sponges and diverse fish. I've seen turtles, rays, goliath grouper, green morays and all of the usual smaller caribbean fish at this site. Olin Miller is a bit gruff but he runs a great operation at Sundivers. When you get out of the water, there is a lovely outdoor bar and restaurant (Macabuca) right there if you need refreshment. Lighthouse Point, run by Divetech, is a nice site as well but IMHO does not come close to Turtle Reef. Cobalt Coast is a very good shore dive as well, but is a longer swim and is weather dependent as it is on the North.