The Kepler Track and the Milford Track are two multi-day Great Walks around Fiordland. Both operate on a public hut system where overnight stays in the huts are reserved in advance. The demand for both trails is quite high, but Milford must be booked even farther in advance than Kepler. I don't plan ahead enough to have been able to reserve the huts, but I was able to do a 40km return day hike into the Kepler Trail to one of the summits and then back out again. The Milford Track is only 50km and I was seriously considering doing a one-day blitz of the entire trail, but I sprained my foot on the Kepler descent, so I'll have to save Milford for another visit. The Kepler summit provided the most diverse 360 degree view I could imagine. One one side was a fjord nested between both green and snow capped mountains and on the other was a flat grassland, lake, and town. Truly amazing. This is the New Zealand I had dreamed of.