zurich/lucerne/interlaken--suggest things for kids to "spot"

I am making "Secret Agent" dossiers for my kids (9,13) for our trip to Zurich/Lucerne/Interlaken. If anyone has something they know of that I can include, please list it (ex.---find the sweet shop next to the clock tower, find the ski shop on Baker street with the duck out front, etc.). It does not have to be historic--just something that they could find without too much trouble. thank, Elaine