Angela, If you are at all interested in the history of the Indian Wars and would like a great read for your trip, buy "Voices of Wounded Knee" by Coleman. There is a place in the Badlands called "The Stronghold" and was important an locale during the wars, he mentioned it in his book.
My DW and I loved the whole Badlands area and thought how beautiful it is, we stayed in the NPS campground there and really enjoyed the visitors center which is not to far up the road.
All of the places mentioned so far are great and deserve to be viewed at a leisurely pace. Don't rush, take time to learn how important these places are. As someone said, "There ain't no place like this place anyplace".
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II