you will easily find activities for kids that age. in Ollon, you have soccer, badminton and swimming classes, archery in Collombey, horse riding and tennis all over the region, figure skating and ice hockey in Villars, Monthey, Leysin and even Vevey with the temporary skating rink managed by a fantastic lady who, by the way, is a tennis expert and instructor in summer (i'll give you her name in a private message if you are interested). Am myself a figure skating instructor so am familiar with the skating rinks all over the region. In Leysin, you'll find dance classes (classic, hip hop), for kids as young as yours), gymnastics, taught by a very energetic, nice a and capable woman (she is australian or new zealander, can't remember). and that is a small sample of all the activities your kids can enjoy around here.. for sports summer camps, you might have to register your kids with a club beforehand (such as ice hockey, for example). otherwise, you have this site for summer camps that my kids really enjoyed when they were your kids'age: http://www.mjsr.ch .