It's almost a year since Susan's and my road trip up and down the North and South Island. South of Rotorua, where we visited the Whakare Thermal Springs, lies Mount Tongariro. Mount Tongariro is famous for it's one way19 km hike. Transportation can be arranged to bring hikers back to the carpark at the start of the track.
It is also famous for being used in the Lord of the Rings films for Mount Doom.