Cali - go online - check "mountain biking in carbon canyon/chino hills" and I think a route map will come up in one of the posts. I know that's how I found the trails on the Chino side of the Park.

It is a huge Park. I have never explored all of the Chino side. I know there is an entrance off the 15 to the Park and someday I'll check it out. I have done all of Telegraph, South and North Ridge plus Sycamore, Bovian and Rapture. The Park is well marked so you shouldn't get lost.

The Rapture photo I'm assuming was taken early spring (like January or February), before the mustard and other weeds overtake the trail and just after the winter rains start to green up the hills. Right now the trail is easy to see, but hills are brown, especially on the Chino side where the mustard has really taken hold. The Carbon Canyon side still has some green.