I love the smell of cool freshwater on hot rock. Bent's Basin is a great freshwater swimming hole in the Nepean River in Sydney's west.
I enjoyed circumnavigating the water on the day I was here, lazily breaststroking, the only person swimming (though others were picnicking). The water was cool and the sun was warm. Afterwards, I lay on a rock, like a lizard, until I got too hot, and jumped back in for another ten minutes float.