Spa Thermal Park is free and is a large park (in itself not very special from what I've seen). Especially fine Hot Stream which flows into the Waikato River. An ideal mix of hot and cold water, lovely to relax! Many locals come on weekends to the park, and specifically this Hot Stream. At these times it may therefore be busier.
There are several pools, which are closer to the source. Here, the temperature of the water varies, therefore, and may even be called. You can park on the parking lot of the park, there are, however hours. Keep this in mind!
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