From what I read there is a whole section of the water park that is a nude spa area with saunas treatment and pools. Must be 16 and up from what I read. Pretty good reviews on tripadvisor and I'm sure there are many other places in Germany. This one seems like a us water park with "added features" <img src="http://www.traveltalkonline.com/forums/images/graemlins/Laugh.gif" alt="" />