Walking around Whatipu is very different from other beaches in the Waitākere Ranges. From the car park, you will quickly realise that you are in a large amphitheatre framed on 3 sides by ancient volcanic peaks and hills.
The panorama is spectacular. If you follow a track for about 30 minutes to the west alongside the campground and then to the edge of the cliffs, you will eventually come to the Whatipu Caves. The first 2 or 3 are quite small, but there is a larger cavern a bit further on. Apparently, it was once used for formal dances. Keep going, and you will find a campsite at the trail's end.
The south-southwest side of the trail has extensive lagoons and swamps, an unusual sight in NZ. The big lone rock sticking up is Cutter Rock, a part of which collapsed some years ago.
Alternatively, head to the beach to the south from the car park. It takes about 20 minutes. The walk is scenic, through regenerating forest.