This preserve is over 1400 acres with over seven miles of dirt trails that are open to hikers, bicycles and horses. The land is primarily chaparral with some wooded areas near the creeks. Wildlife includes deer, coyote, and brush rabbits.
The entire preserve covers 24 miles of trails. The Mt. Umunhum Area hosts twelve thousand acre areas that are home to abundant wildlife including mountain lions, deer, bobcats, coyotes, and and fauna includes serpentine grasslands, chaparral, bay trees and oak woodland forests. Mt. Umunhum is a 3,486-foot mountain that is not accessible by trails. Instead, the 6.2-mile Woods Trail that starts at the Jaques Ridge parking area, takes you to the 3,000-foot Mt. El Sombroso. There are restrooms but no water availability so bring water and sun protection with you.
Vasona Park is 150 acres and includes the Viola Anderson Native Plant Trail. The flat paved trail around the lake is used by pedestrians, bicyclists, and roller skaters. The trail runs for about 14 miles through the Town of Los Gatos, Vasona Lake County Park, Los Gatos Creek County Park, and the cities. There are multiple restroom facilities.