Excellent hiking.
Traveling on either Interstate 680 or 880, take the Calaveras Road exit in Milpitas. Drive east towards the foothills along Calaveras Road. Calaveras Road passes through the southern portion of Ed Levin Park. There are two main use areas in the park. The Sandy Wool Lake area is located north of Calaveras Road and the Spring Valley Pond area is located south of Calaveras Road. To reach the Sandy Wool Lake area, take a left turn off Calaveras Road onto Downing Road. Travel north along Downing Road to reach Sandy Wool Lake, the hang gliding area and the main trail use areas. To reach the Spring Valley Pond area, continue along Calaveras Road, past Downing Road and turn right into the park area to reach the Ranger station, Visitor Center and Spring Valley Pond. Spring Valley Golf Course parking and Club House is located across Calaveras Road from the Visitor Center.
http://www.tripleblaze.com/trail.php?c=3&i=7318