An interesting hiking and rock scrambling area, with sweeping views of Simi Valley and parts of the San Fernando Valley, as well. Located close to the infamous Rocketdyne/Boeing Field Lab, you also get some good views of the facility, including some of the Superfund cleanup areas from rocket testing.
There is one big loop trail, but many side trails and offshoots that take you to many interesting rock formations and overlooks. There are many varied flora and fauna, including deer, bobcats, and an occasional mountain lion. Parking in the lower lot is free, with a pay ($5) lot up the paved road a bit.