Bad lands area
We have a night at Cedar Pass Campground (in the Bad Lands Nat'l Park) before heading to a KOA at The Devils tower for another night, then off to Custer State Park, Blue Bell for 2 nights then Sylvan ...
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Definitely Mt. Rushmore (be sure to get the view driving around the left end of it -- very impressive) and Crazy Horse.
And so you see opinions vary a lot on those two attractions.
