I was hoping to get some advice on places to eat (and anything great to see) on a road trip I'll be taking in a couple weeks. We're driving from NYC to Rapid City/Badlands area SD on I-80 to IL, then I-90 to SD. Going down to Denver for a few days before heading back to NYC, most likely on I-70.

Does anyone have some suggestions on places we need to eat, or sights we need to see, preferably close to the Interstates mentioned above?

Thanks in advance