They’ve rearranged the entrance to the place again, so the map (p. 157) is no longer accurate. You now enter through a break in the wall halfway along the north side of the site. The plan is to have the exit on the south side, but this was closed when I was there (Nov 07), and everyone was still exiting through the wall in the middle of the west (inland) side.
The really nice change is that it’s possible to walk to the site from the top end of the beach road–there’s even a little parking area there now (mostly for taxis). It’s a shorter walk from the end of the beach road to the ticket booth than it is from the parking area on the highway.