Upper Las Virgenes Canyon Open Space Preserve Santa Monica Mountains National Recreation Area Locate the trailhead. I was thinking to go up to Fish Canyon and see the waterfall again and had decided on doing it the easy way with the shuttle running, but at the last minute decided to do an easy hike somewhere I'd never been. Since I hadn't printed out the rudimentary map found on the Calabasa city site, I ended up having to do it by memory. There are none available and wasn't even one posted on the information board at the start. The day was heavily overcast and the weatherman was threatening rain, so I tossed in the rain gear. Although this is a canyon, the surrounding area is so flat, it is not a flash flood danger. In fact, Cheeseboro is more of a fold between rolling hills and doesn't even have anything flowing down it. I parked at the end of Las Virgenes and at the edge of Los Angeles county, then walked into Ventura county and wild spaces. I took t...