Los Penasquitos Canyon Preserve East-West trail provides access to the majority of the Preserve's trails.
Start at the Penasquitos Creek Park parking area and head west. The trail will wind around the creek and end at the highway. There are several creek tributaries you can cross along the trail. At the highway you cross the overpass and return on the South side of the creek heading East.
Besides the main trail, there is singletrack along the creek and outside of the main trail.