Just inside the Black Hills National Forest, the Mount Rushmore National Monument is easily accessible and a quick place to see (or longer if you like, there are plenty of displays to read). It also gave me the first glimpse of how spectacular BHNF is at this time of year. Not quite peak colors here yet but getting started.
After talking with the park ranger, my plan is to scope out the National Forest camps in the area and pick the first one I like. Back to the road!