On 3/22/2008 I hiked into Agua Tibia Wilderness from Dripping Springs Campground (on Hwy 79, near Temecula) hoping to reach Agua Tibia summit but did not because I ran out of time. Agua Tibia Wilderness straddles the Riverside-San Diego County line and is located west of Palomar Mtn.
Full TR.
. . . Rob