Zurich Switzerland in Feb

I know not the usual place you think of when you are considering where to get naked.  But I have one day thereon my way to warmer climates and am just looking for any advice as to what to do clothed or nude.   A sauna or spawould be welcome  but any must do's  are a welcome answerAlso if anyone enjoys hosting a fellow nudist for one night a cheap place to stay would  be awesome too.thanks
Feb 20 - 21st