Mt. Rushmore is absolutely impressive. Driving to the sculptured mountain you come upon occasional outlooks where you can see the four presidential faces from a distance. I didn't have much luck getting any extrodinary photos from these lookouts, though I did try.
There was adequate parking at the National Memorial on each of the occasions that we visited. A little climbing is necessary to get from the parking lots to the public areas.
A large gift shop and restaurant sit opposite the actual monument, surrounded by a large patio-type area. Available on the patio area are those wonderful silver binocular-type machines that you put money into for better viewing of the sculptures.