This geothermal area sprang to life when hydroelectric tinkering around the power station caused water levels to fall. The pressure shifted, creating new steam vents and bubbling mud pools. The 2.7km perimeter loop walk takes about 45 minutes and affords great views down to the lake and mountains beyond. There's a kiosk at the entrance, staffed by volunteers who keep an eye on the car park.
More active from June through August when it's cold and wet (from December through February, summer can dry everything out), it's signposted from SH1 about 5km north of Taupo.