It’s a free activity to go and watch and wander around. There are some aspects of the area which you have to pay for, but this one is free.
The sulphur smell wasn’t too bad either.
I guess it is habit to assume it will be bad.
This particular geothermal feature is 45 metres across and the temperature ranges from 60℃ and 80℃ in the pools but can reach 100℃ in the steam.
This feature cannot be aged as the Wai-O-Tapu geothermal system is several thousand years old. It was significantly impacts about 650 year ago when Mount Tarawera erupted. Many hydro-thermal eruptions were triggered in the Waiotapu area at that time, (i.e. many of the larger crater lakes lie in craters formed at that time).