The Quarry Lakes Natural Unit provides visitors excellent opportunities to hike and ride bicycles. The park's trail network connects to the Alameda Creek Regional Trail, which extends from Niles Canyon westward all the way to Coyote Hills and the Don Edwards National Wildlife Refuge on San Francisco Bay.
From I-880 in Fremont, take the Decoto Road exit east and proceed to Paseo Padre Parkway. Turn right on Paseo Padre, then left on Isherwood Way. Proceed to the park entrance on the right. From Mission Blvd (Hwy. 238) in Fremont, turn south on Nursery Ave. (away from the hills) and right (west) on Niles Blvd. Turn left on Osprey Drive and left on Quarry Lakes Drive. Proceed to the park entrance on the left.
http://www.tripleblaze.com/trail.php?c=3&i=7034