Park in the large carpark adjacent to the surf clubhouse at the end of Bethells Rd.
Watch out for rogue waves that may surge further up the beach than the normal ones on the day. If you clamber onto the rocks they may be a bit slippery, especially where they have green algal cover. On the rocks watch out for big waves surging up onto them. Do not attempt this trip when the tide is high.
Walk 400 m on the sand alongside the Waitakere River estuary to Te Henga/Bethells Beach, turn left (south) and walk a further 1200 m to the rocky cliffs at the south end of the beach. Not accessible at high tide. Best accessed at mid to low tide levels. You can see most of the interesting geology from standing on the sand at the base of the cliffs but if you wish you can clamber on to the high tide platform and walk along that out to the point, but not beyond.