A SCAR (self contained adventure racing) event.  Cruise up and over the 'real' Hump (of the Hump Ridge), and then down the longest waterfall in NZ (the Wairaurahiri River) by packraft, before returning to where you started via the South Coast Track and/or a bit of playful paddling in the Southern ocean.  A bit less paddling than the Big Hollyday, but a bit more whitewater.