since your going to be in Rapid City, checkout if it is time for the buffalo (bison) roundup in Custer State Park. we saw it several years ago. here we were just riding along the park road looking at the sites when we came upon several vehicles parked at the corrals when all of a sudden cowboys & real Indians, jeeps and a helicopter was bringing a large herd of bison to the pens. we stopped & watched how the whole thing was done. they had a viewing stand for visitors. it was something to see and smell (stink) that I still recall to this day. they keep about 1500 in the park if I recall, give Indians a percentage and sell the rest on the open market. it was very interesting to watch if you can take the smell from the branding.
maybe they still let the visitors to view this.