Idea #1: If you are looking for children’s books in other languages, some of them obscure, check out the Big Universe site.
Czech? Check. French and Spanish, mais si! German? Nein! Figures.
They also have English, of course. Might be fun to browse around with the kids.
Idea #2: Need something more interactive, but still sorta techno? Set up your video camera to feed into the TV, so the kids can dance around and watch themselves live! On TV! Amusement for a bare minimum of 30 minutes. Plus, you can secretly tape their antics.