Spend a day chillin' in Amish country (northern Indiana, central Ohio, southeast Pennsylvania.) If you're lucky you might get to try out your Swiss German on some Amish people - best to warn them first though, they don't expect to hear it from an 'englischer' and your accent may throw them. "Kann ee au mol deitsch shprecha?"
If you're on I-80 - and with that itinerary I reckon you might be

- jump off at Dubois (western PA, pronounced Due-boyce) and eat in the Dutch Pantry. That's Dutch as in Deutsch, not Dutch as in Dutch...
Truck stops in Ohio are always good for horrible kitschy memorabilia - Elvis in a trucker's hat, portrait of Mr. and Mrs. Obama with rainbows and hearts round them, etc.
And the world's largest ball of paint is in central Indiana - if you're into that sort of thing.