Out and back course from Zimmerman Park on the Skyline Trail along the top of the Rims. The course grade is generally downhill from the start to the turn around, losing ~140ft elevation. So save some energy to push it back uphill to the finish. Please note that the trail has a few traffic crossings just east of Zimmerman Trail for the residences on top of the Rims. The course is open to traffic; yield to traffic. 

Parking: Zimmerman Park (map)