Rotorua is a town in New Zealand's north Island that is famous for its thermal grounds. There are lots of hot springs here and lots of places with thermal activities. A walk around the park, and you can see lots of steam (stinky though), some boiling water, lots of gas escaping and sometimes even what looks like boiling mud. There is a small place where the temperature is right for soaking tired legs.
For more information, visit their website:http://www.rotoruanz.com/