The natural springs here are home to wild trout and eels, which you can peer at through an underwater viewer. There are interpretive walkways, a new 'Big Splash' water ride, and plenty of animals, including tuatara (a native lizard) and native birds (kea, kaka and pukeko). A highlight is the Kiwi Encounter , offering a rare peek into the lives of these endangered birds: excellent 30-minute tours (an extra $10 per person) have you tiptoeing through incubator and hatchery areas.
Rainbow Springs is around 3km north of central Rotorua.