The hottest of the pools photographed and the unphotographed one in the scrub have the potential for a higher rank than the three I gave if they were worked on.
Note none of these pics are of the pool in the scrub which would be the best place to bathe. It is too overgrown to get a decent photo.
Photo of mineralised hot water trickle below the pool in the scrub. (warm)
Photo of the hottest pool of water near the river edge (nice hot bath temperature) about 10m upstream of the mineralised trickle
Photo of largish pool c.600m downstream of the others (luke warm, pool floor slimy) Not on main river but a flood channel. Sulphur smell.