There are countless tours that take place in the area surrounding the volcano, and for good reason! (bluecrabtours.com)
Alternatively, explore the countryside surrounding the volcano via mountain bike, selecting from a variety of trails that run through rolling hills and jungle. (nationalgeographicexpeditions.com)
Also check out the awesome views of surrounding volcanoes from Tongariro National Park — including Mount Doom from Lord of the Rings. (gapyear.com)