Unfortunately, the country is not made up of all desert and sandstone. I am in the New England and there is plenty of mud just covering some good rock trails. So, it tends to be slick yet doable with practice. I want to got to where its all rock/sand some day.
I really love running the trails out in the high desert near me. Last Chance Canyon, Dove Springs, Jaw Bone... There are so many great views to take in while running trails. Love running ridge line trails and ending up at a peak around sunset looking out over everything thousands of feet below.