There is a good reef system there and one wreck. Depth is not that deep so you can get bottom times. Lots of animal life from turtles to snake eels. These are very skinny eels that are mostly grey with spots and are not dangerous.
The marine park is on the West side of the island about half way up the island. It is just a couple of miles North of Holetown. You go past the Sandy Lane Golf course, the Sunset Mall and then the West Coast Mall. There are small strip malls. The entrance to the park is marked by a very small sign on the left side of the road. If you go by St James Church, you have gone to far.