The Mount Evans Scenic Byway is the highest paved road in North America. An hour away from Denver, the road ends a few hundred feet from the summit of Mount Evans, a Colorado 14er (a 14,000 foot high mountain).
Early in the morning you may find that low-lying clouds are actually lower than the road; it’s a beautiful sight.
Entrance to the Mount Evans Recreation Area entails a fee of $15 or less for motorcycles; you can see the full fee list here. Note: a National Parks Yearly Pass, or the “American the Beautiful Pass” allows entry here as well, and costs only $80 while allowing access to all national forests and national parks.