Utah has some great motorcycle roads. We visited the Big 5 (Arches, Canyonlands, Capitol Reef, Bryce Canyon, and Zion) National Parks this past summer, and after entering Utah from Colorado, all were on the back Roads. Spectacular views. UT-128 from Cisco to Moab, UT-24, UT-12 and UT-9 are must rides. And just a short ways west off of I-15 is the Valley of Fire in Nevada.