Mount Tongariro - when we visited past it last weekend it was shooting off steam from the mountain.
This area is NZ's oldest national park and is considered extremely important in Maori culture. There are many walks and treks but you have to be pretty experienced to attempt these, quite a few people have to be rescued because they are ill prepared for the temperatures and the terrain. Not only that but it also offers hunting of red deer and mountain biking.
A truly special place :-)
