At Rancho Sierra Vista/Satwiwa in Newbury Park is a nice assortment of trails that reward hikers with beautiful views and peaceful surroundings. Find your way to the Satwiwa Native American Culture Center and from there walk up Big Sycamore Canyon Road where you'll reach a fork in the road. If you go straight you'll be taking Big Sycamore Canyon road about 6-7 miles down to Sycamore Canyon Campground and Sycamore Cove Beach. The road is paved for about 3 miles until it intersects the Backbone Trail, at which point it is dirt trails to PCH.
Getting back to the benches at the top of Sycamore Canyon, looking off to the east you'll find the Boney Mountain Trail sign that takes you towards the Hidden Valley Overlook, Waterfall and Danielson Monument, a .4 mile, 1 mile and 2.2 mile one way hike, respectively.
Take the trail to the fork in the road. A sharp left takes you directly back to the Satwiwa Center, a "normal" left takes you on a trail towards Wendy Drive and/or back to the Satwiwa Center in a loop, and a right turn takes you up the hill towards the destinations mentioned above.
A short walk up gets you to yet another bench that overlooks Sycamore Canyon from another angle. This is called the Sycamore Canyon Overlook.
The rocky trail from there takes you to a fork, where you can either veer left to the Hidden Valley Overlook trail or right to the Danielson Monument and Waterfall, as well as the Old Boney Trail.
The Hidden Valley Overlook trail is rocky and a bit challenging and gets you some nice views of Dos Vientos off towards Camarillo. It ends with a nice "overlook" of Hidden Valley.
Off to the right, a jaunt down the hill gets you to a sign that tells you you're getting close the waterfall.
There's a stream crossing that most of the year is easy to get across as there's not a lot of water in there, although in particularly rainy winters it can get more challenging in the winter/spring.
So after you cross the stream, you're off on a mostly narrow, single-track trail. Watch out for poison oak on the sides of the trails. I usually run up here in shorts, but you're much safer wearing long pants. The next juncture in the trail, you go straight to the waterfall, or veer right up to the Danielson Monument.
So if you take the sharp right hand turn, you're on your way to the Danielson Monument (a tribute to Richard K. Danielson, who lived on land in this area for 32 years with his family, until it was sold to the National Park Service in 1980). Awesome views from several vantage points as you head up the trail. A bit of a climb. Be prepared! Check out other photos of the monument HERE and larger pics HERE.