My buddy Will and I did about a 40-mile loop outside of Moab, up the Shafer Trail, a few miles up on the mesa and then back on dirt down Long Canyon. Part of the ride is in Canyonlands National Park. Mostly jeep trails and pretty rough in spots. Even with fat knobbies, I had to walk a couple places, but Will is a much better dirt rider and makes it look easy. He's even done the loop before on Hetres, no way you'd get me to try that!