No visit to Rotorua is complete without exploring at least one its geothermal parks. And if you're only doing one, make it Wai-O-Tapu. Set between Rotorua and Taupo, its not quite as central as others, but the drive is absolutely worth the reward at the end.
Besides the walk around the park, there is much to learn for kids of all ages. The different formations and geothermal activities will keep the questions rolling. It's best to revise up on your geography lessons before visiting this park.
A small drive away is the Lady Knox Geyser which puts on a show every day. Be sure to check for best times to go and get there early to get good seats.