Don't be surprised to see people on horse with long and short arms walk into a restaurant for lunch. My ex is from the Black Hills area and I was pleased to see how 'Old West" SD retains. There is a tourist industry depending where you are, but with 700,000 people or so in the whole state, you will know your neighbors, even if they are 10 miles away. I really wanted to move there but the job market for my skill set did not work.
I love South Dakota, great people, beautiful spaces, simple living.