Planning a driving trip for next summer from St.Louis to West Yellowstone. Will be taking I 90 getting there to see Badlands and Black Hills on the way there. Instead of coming straight home thought it may be worth while to drive through Idaho and Utah then southern Colorado on the way home. Would appreciate any ideas or opinions on this plan (mainly, is it worth the extra driving and hotel costs.). We thought this way we could see Arches and Canyonland Parks then swing by Mesa Verde . Looks like a lot of two lane roads and empty spaces leaving Mesa Verde heading east. Anyone taken this route??