I wrote full trip report in Wilderness Mag about 1999. After3-day missionFrom Hokianga Harbour down to Kai-iwi Lakes.
Maunganui Bluff was main highlight,approx 400m up, I think. Scary view off the edge down to surf below.
Southern track was wet long GRAS a hidden rocks- ankle breakers!
HB: easiest route to top will be along road, not from beach like my party did.