"The Valley" is an area in northern Oceanside, CA, mostly famous for its old drive-in theater. It's located between the Camp Pendleton Mountains and the hills just south of Highway 76. The Valley divided into different sections: North Valley (aka Deep Valley), Mid Valley, and the San Luis Rey Valley.
Mission Avenue, Highway 76, and the San Luis Rey bike trail mark the center of the valley.
Dude, that's area's weird. It's really nice, and really ghetto at the same time.
Yeah, that'd be The Valley, Oceanside.