Badlands, and wind cave S. Dakota that bad?

Went to both last summer with our three youngest grands. We stayed 4 days in Custer, and did the park and the caves in the area and moved on to Wall and did the Badlands. The park is great for younger children that aren't quite ready for Yellowstone. They like the caves, and the Badlands were a bit different although I don't think their favorite part. The buffalo in Custer seemed to be the highlight for the boys, and Rushmore for the girl. All in all it was a good area for their ages. We have been there many times , the year before with the teenaged grands. The little ones horsebacked rided at Blue Bell. I don't know about staying in the park as we stayed in Custer. I think it is a busy area, we went in June and there were quite a few people there. We always try to go right after the kids are out of school to beat the crowds.