Luelf Pond Preserve offers two miles of trails.
From San Diego: I-15 N; take the Scripps Poway Pkwy exit, Exit 17, toward Mercy Rd; turn right onto Scripps Poway Pkwy; travel 8.6 mi; turn left onto SR-67; travel 7.9 mi; turn right onto Dye Rd; travel 1 mi; turn right on Southern Oaks Rd.; travel 1 mi; turn right onto Willow Oak Dr.; Willow Oak Dr. becomes Duck Pond Ln.
http://www.tripleblaze.com/trail.php?c=3&i=7104