If you will happen to be in southern Poland in winter time and have at least 1 free day, don't hesitate to spend it skiing. Whether you will stay in Wrocław, Katowice or Kraków you should have easy access to ski resorts within hour or two drive distance. All you need to do is to find the closest destination. That shouldn't be hard for searching in google ie. http://www.skiing-poland.com/index.php/ski-resorts/szczyrk.
Our video presents Soszów ski resort in Wisła, Silesian Beskid mountain range.
Good luck, have fun