Redwoods on the River is a large park for the San Lorenzo Valley. That said it's a small park located a 265 Brown Gables Road, Ben Lomond 95005. This is a leased space all age park. I'd estimate there are about 35 units on the park under the redwoods, on the river. During the summer this is a beautiful hidden location, quite close to town.
Redwoods on the river contact info (831) 336-5182