The cafeteria area at Mount Rushmore is quite spacious with plenty of options for the entire family. I had a buffalo burger and fries, which tasted good. The buffalo stew was enjoyed by other members of our party - it looked and tasted delicious. I also highly recommend the ice cream - soft serve and scooped ice cream are available. You can even get vanilla ice cream made with Thomas Jefferson's recipe.
While you're eating be sure to look up at the ceiling lights (see picture) that pay homage to the carvers of the mountain - nice touch!
The food is a bit expensive but that is expected at a place like this. It is convenient though, and if you sit by the large windows you can enjoy the view. Chipmunks running around outside are fun to watch as well.