We would like to take 10 days this April to drive from Chicago out west and back again. Points of interest are Mt. Rushmore, The Badlands, Yellowstone, any other historic landmarks and if we have time, Glacier Park in MT. It will only be my husband and myself and we would be staying in hotels or cabins or whatever is cheap, along the way. Any route, sights, places to say and/or eat, that you could suggest, would be greatly appreciated. Thanks!!