As part of our month-long Colorado road trip, we stopped at a fossil quarry site along I-70 near the Utah border called A Trail Through Time where you can see a few fossils still embedded in the rock:
Afterwards we chose to check out the mountain biking trails in the BLM area just across the highway. Turns out this very pretty area, Rabbit Valley, is part of the popular Kokopelli Trail that continues southwest into Utah and all the way to Moab, over 140 miles. We just ended up riding as far as an overlook of the Colorado River that afternoon before returning to our campsite for dinner and to watch a very cool, very active, distant thunderstorm. I went for another ride later that night after dark.