My buddy and I Entered on the East side of the Haleiwa boat channel. It is pretty shallow here for the first few hundred yards. Head for the Green Buoy that marks the channel. Just to east of the buoy is some really great shelves that range from 5' to 40', lots of walls and pinnacles. Minimal current. We saw perhaps 40-50 turtles in the span of an hour. The reef is in really good condition here, too. It was pretty flat the day we went which is key here for good visibility. We snorkeled just to check it out, and is pretty good for an advanced skin diver (it's a long swim out). Note: Make sure you have a dive flag and stay out of the channel, the boats rip in and out on a regular basis. Also if you are spearing, stay east of the Harbor since this site is just outside of the boundary.