“Utah has the best rocks.” That’s what my friend Shellie told me when she learned about my plans to visit the Mighty 5 National Parks in Utah on a road trip last May.   I laughed and nodded. But I didn’t really understand what she meant until we turned south on Utah 128, not long after crossing into the state on I-70 from Colorado. We’d just driven through the magnificent Rocky Mountains from Denver. We’d gaped at several 14-teeners, wound around numerous lofty cliffs, and...