Head up trail along Vallombrosa till the freeway underpass, turn right on pavement path, then left on a small park road. Single track runs between road and the creek, weekends can have a lot of foot traffic, early week days are best. At Manzanita you can take a short pavement path to the Five Mile and head to Upper Park if it is not closed after a rain
Hwy 32 West to Cypress St right on Vallomborsa Ave, right on Vallombrosa Way, parking lot on left.
http://www.singletracks.com/item.php?c=1&i=4305