How to boil this trip down to 5 pictures? We headed west with Hank and Marilynn, also driving Jill and Tara, and Gail, Steve, Andrew and Danielle. We did about half the sights together and the rest as a smaller group.
Attractions/sights you can ask us about include the Corn Palace, Badlands, Wall Drug, Reptile Gardens, Mt. Rushmore, Needles Highway, Iron Mountain Road, Wildlife Loop, Wind Cave, Crazy Horse Memorial, Rapid City, SDSMT Museum of Geology, Pipestone National Monument, the Mammoth Site and the Goblet of Fire. (2700 miles - we needed a long audiobook.)
Pictures: Pipestone waterfall, Badlands, Wall Drug cafe, X shaking Madison's hand, Needles Hwy vista, Henry as Crazy Horse, and the family posing with James Monroe. (Rapid City is decorated with the statues of presidents.)
Our favorite "attractions" were Pipestone and the Mammoth Site. But everything listed there was worth it. I'll pass along the excellent advice of my cousin Mary Pat - spend as much time in Custer State Park as possible.