Rancho Penasquitos Canyon Professional Review and Guide
"Sure, it’s an ambitious distance to tackle, but this 6.5-mile hike follows smooth, nearly level fire roads for most of its length, and ends at a soothing waterfall where you can soak your sore feet before heading back up the canyon. Along the way, the California live oak canopy shades great rest stops. It’s no wonder that the La Jolla Native Americans lived in the area for more than 5,000 years—the oaks provided acorns, an important staple of the native diet. In 1823, the Rancho Peñasquitos Canyon Preserve was part of the first Mexican land grant in San Diego. The oldest private residence in San Diego, the Rancho Santa Maria de los Peñasquitos Adobe, built around 1823, still stands near the parking lot for the hike."