Although there are a few areas where road biking is popular (we heartily recommend using a road bike at Zion National Park), Utah really belongs to mountain bikers. With some of the grades you'll find, be sure you have plenty of gears. Moab claims to be Utah's mountain biking capital, but there's no dearth of opportunities in other parts of the state, either. Be aware that mountain bikes must remain on designated motor-vehicle roads in most national parks, but are welcome almost everywhere in areas administered by the U.S. Forest Service and BLM. In addition to the exciting and often challenging slickrock trails of Moab, you'll find excellent trail systems just outside of Zion and Bryce Canyon national parks. We also like the warm-weather biking at Brian Head Resort near St. George.