We're here for Cedar Point (green star on map below), "the roller coaster capital of the world" and recommended by our friend Michelle:
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This is also the first of three "bonus" stops on our way to Mount Rushmore. The other two are in Wisconsin and Minnesota. Nothing in this region was on either of our top ten lists when we started planning this road trip, but we've found some pretty cool stuff just because we had to stop near it on the way to somewhere else.