A trip in the making.

Hello friends, I have a mission for you. Next month I'm going to be driving from southeast Washington State to northern Minnesota in order to visit my husbands family. We'll be going mostly by way of I-90 and then I-94 and will be hitting I-29 at the last. I'd love to know of any great gluten free places to eat, or things to see (gluten free or otherwise) along the way. I would like to get as much out of this trip as I can. I can't wait to hear some suggestions!!