I thought it would be worth compiling a list of things to do in Switzerland for those with kids, primarily aimed at giving parents a break.
I'll start.
Madrisa in Davos has "Madrisa Land" where they will take kids for 10chf for the first hour then 5chf per hour. Lunch is 8chf. They take kids 0-6, you don't need to book in advance, just drop them off earliest 09:30 and pick them up latest 16:00.
They have a great kids park with trampolines etc to keep the kids entertained.
Madrisa-Land Davos Klosters