"Not much else to look at in that part of the country. Besides, it's kinda like going to Quartzite...gotta do it once. "
Well, I beg to differ. If the OP is taking I-90, there are a number of outstanding things to see along the way. Badlands National Park is amazing. The whole Rapid City area is wonderful, especially Custer State Park which is more interesting and more beautiful than many national parks. Of course, Mount Rushmore. The Crazy Horse monument. Devil's Tower National Monument, and one of my favorites, the
Minute Man Missile National Historic Site