Tequesquite Arroyo features 9 miles of hiking trails near Riverside, CA.
There are two trail heads for this area. From the 215, you'll want to exit on Alesandro. Head West of the Fwy. to first light which is Sycamore Canyon Rd. Turn Right (Chevron on corner). There is a trail head which is now along a fence line to a new warehouse. Beware of where you park, I just received a $100 ticket for "Parking on an unpaved parcel"(?)...look around and you can park at one of the new warehouses... The second "Official" parking area is at the Northern end of the trails. Instead of exiting Alasandro, head to the 60 Fwy towards Riverside. Exit Central and head West. After the second light, you'll see a parking area on the left.
http://www.tripleblaze.com/trail.php?c=3&i=69