Southern Arizona's Newest Trail Race! 9.5 Miles. Your run begins with the Nature Trail, then to the Bridal Trail to the 50-Year Trail (3.7 miles up) and turnaround at the gate to go back down and off to the Bridal Trail to the finish. The 9.5 mile event is only open to runners. The 5k easy trail run is open to runners and walkers and will be on the Nature Trail and Bridal Trail.