Keystone is a combination of part small town and part resort town. Keystone itself isn't very big, by any means, but the town does offer a number of hotels, and happens to be the gateway to Mt. Rushmore. Due to it's proximity to Rushmore (10 minute drive), and it's location in the heart of the Black Hills, Keystone sees plenty of travelers. Especially during the Sturgis Harley Davidson rally, it gets busy in Keystone. Just like most towns in the Black Hills, there are a few museums and rock shops to check out, definitely stop in if you have the time!