We are heading out from SF to Green Bay, WI down to Chicago and back to SF. We have about 3-3.5 weeks total for this trip, including the time we are spending with friends in WI and IL. We have four small kids under the age of 9. I'm looking for a route that will provide us with plenty to see and do to break up the very long days of driving. We're more interested in national parks than touristy areas but am okay with both. Ideally I'd be able to hit Mt. Rushmore, maybe Yellowstone or some of the sights in Utah or Colorado. I'd also love ideas for easy places to stay and eat as a large family avoiding traditional fast food road trip fare.