Hillary Trail (NZ)
The Hillary Trail, named after Sir Ed Hillary, for whom this was a special place, is 75km in length and features 3,300m of vertical ascent. It is mostly technical single-track running/walking through some stunning bush and coastal scenery.
Note that an 80km race is held annually on the Hillary Trail. The race adds 5km to the route, and also skips one section of the actual Hillary Trail which is in a scientific reserve where events are not allowed: