Excellent hiking trails.
From Sacramento, take Interstate 5 south, and exit at Twin Cities Road. Head east on Twin Cities Road to Franklin Boulevard, and then turn south. Continue on Franklin Blvd. and go past Desmond Road, then proceed two-tenths of a mile to the Willow Slough Nature Trail on the left. The Willow Slough Trail, a three mile loop, is open during daylight hours with parking on the west side of Franklin Blvd. at Lost Slough Boardwalk.
http://www.tripleblaze.com/trail.php?c=3&i=7650