A very useful post (above) with personal insights. As for me, I've always loved the roughness of the Badlands. I could spend days, weeks exploring the region happily.
It's not an easy environment -- I've seen campers literally get blown away at night....
When in the area -- TURN ON YOUR AM RADIO TO THE LOCAL STATIONS. Much of the programming is in the native language. It's a beautiful -sing/song language and it's fun to try and pick out the occasional English words while trying to figure out what they are talking about.
Wall Drug is worth a visit -- but for me worth only the time to get something to drink. I much prefer to be out in the wildness of the Badlands.
Mark