My daughter and I were there last summer with 70 girl guides. Absolutely fantastic. Take lots of warm layers, is my advice. Good stout walking boots. Make sure you go up to the Jungfraujoch
http://www.jungfrau.ch/en/tourism/places-to-visit/ Seems expensive, but worth every penny. Make sure you take a camera, and plan to spend lots of time up there. We went to the ice caves and spent time playing snow games (zip wire, toboggan, etc...) We also stayed in Adelboden (one of the sites for the Winter Olympics) and also visited Kandestag (Scouting world centre). Check out
http://www.thereareplaces.com/newgui...dest/szpts.htm for some other ideas. Have a great trip.