Oh. The colours. Most colourful and best value geothermal experience in the region.
When you arrive, you hop on a boat (after a safety briefing) for a scenic 5 min trip across Lake Ohakuri (on the Waikato River) to the thermal area. The tracks are very well marked and in excellent condition - almost completely elevated timber walkways. You can get close enough to put your hand in the warm/hot water in places. But it is the magnificent range of colours that set this place apart. You only get a sense of them from the photos, come and see it in real life for the full experience. There is a short walk and a longer walk. Do the longer walk if you can.