There have been times on the Magic when the hot moist sauna was too hot to even sit down on the tiles - forget using towels and the cold water.
Many problems plagued the Rainforest prior to dry dock, but when we cruised in October, they were still there - often the Rainforest was closed due to plumbing problems and if not the whole Rainforest, then the saunas - once the large one, once the small one and once the dry sauna was cold - no heat at all.
It presented enough problems for us that we no longer use it unless we check it out first to make sure things are working, then we pay a daily rate rather than get the cheaper "by the week" rate.
Also, in MY opinion, the attitude of the staff there (non-Disney) is less than I find acceptable - and I'm a pretty easy going person.
Rae