Yeah I think I'll have to check out that Bambino Indoor Fun Park - sounds like a blast
What about that big water park thing on the "other" side of the lake - Alpamare -
http://www.alpamare.ch
At only 39 francs per adult and 29 for a child 6-16 for a 4 hour stay, and no family ticket it's got to be a fun day out for the whole family!
No seriously - probably a good thing to add for your list ?
I wish someone would compile a list "What to do on a rainy day in and around Zurich (for young adults)" The list should include more than just "Landesmuseum"
Mark