Highest drop 20m
Tricky off track walk into the head of a granite stream with some waterfalls. Then plunges into a very deep and impressive marble slot canyon for an hour or two.
This canyon is fully described in the Canyoning in NZ guidebook.
[Update 28 March 2016: First descent by; Andy Maloney Chris Pugsley, Kris Ericksen, Bruce Mutton, and Cathy Worthy in 1999]