On the way to Darwin I stopped at Mataranka. There are a few thermal pools to choose from and I found my favourite at Bitter Springs. These pools flow at a constant 32 degrees and are still very much in their natural state. In this one you can glide with the current downstream and pop out the other end. Well I thought I was gliding like a lilly! Not a bad way to break from driving.
PS: If staying staying overnight in the area, please be vigilant of the local wildlife, especially if they answer to the name of Bruce. Will initially present as helpful, but will need intensive convincing that he is indeed not the man of your dreams, even only for one night.