Tucson’s recently completed Rillito River Path is a fully serviced 10-mile trail that includes water fountains, restrooms and even exercise stations. Just outside the city, you have access to trails in Catalina State Park or ones that follow the Sabino Canyon—two picturesque settings in which to log miles.
The Windy City’s winding lakefront trail along the North Shore provides spectacular views during the summer and character-building blasts of cold wind in the winter. Run to the Shedd Aquarium on a warm day and look back at the city skyline; the view is breathtaking. The Chicago Marathon is one of the five World Marathon Majors, and ranks among the flattest and fastest courses in the U.S.