If ever a state was made for biking, Colorado is it. In fact, the Olympic team trains here. The Rocky Mountains are replete with trails for all levels of expertise, from novice to expert, and paved bike paths are found throughout urban areas. There are also bike rentals in every vacation spot or recreational area – so you have no excuse not to put your mettle to the pedal. Some great trails to try are Buffalo Peak near Pine, which is a short drive west of Denver; Red Rocks/Dakota Ridge, also just west of Denver; the trails of Colorado Monument outside of Grand Junction; the Summit County bike trail system that takes you from Breckenridge to Vail, around Dillon Reservoir and over part of Swan Mountain; and Cottonwood Pass west of Buena Vista.