You're planning a roadtrip, right? It's Mt. Rushmore! Go see it if you haven't yet. Pay to park. There is also a fantastic little tourist town below, which I enjoyed as much as the memorial itself - great place to grab dinner, a beer, and as many Mt. Rushmore novelties as one would ever want. The scenery is gorgeous and the air is fresh. There was a laser light show after dark. My parents loved the photos and I'll probably see them again in the Christmas card.