Get loopy at Elijah Bristow State Park at this way-funner-than-it-sounds race. The course is a 1.05-mile loop at a park right next to the Willamette River, east of Eugene, Oregon. With an amazing aid station to support you for as many laps as you can or want to run in the 12- or 24-hour time period, you can push yourself to set a new distance PR, practice running at night, or just use it as an excuse for an active party with your friends.