We go hear semi-regularly. Recently the council have built wooden railings and steps down into the water. Im not sure if this was to prevent people walking along the banks or to commercialize it so much that it drives out the skinny dippers? Where it use to be a fairly secret spot, is now blatantly obvious with all the wooden railings and steps that every car that goes past stops, if not for a swim, a perv!
If you enjoy bathing au natural go in the late afternoon once Wai-O-Tapu Centre is closed.