Whether you cycle the entire 109 miles or just rent a bike for an afternoon, the Mickelson Trail is an awesome adventure for the whole family. It is an absolutely gorgeous ride through some of the most beautiful parts of the Black Hills. With 4 train tunnels and over a hundred bridges, not to mention rolling hills, open pastures, and old gold mines dotting the trail, there is plenty to look at and enjoy on the Mickelson Trail!