Hey Razor,
First, congratulations to you for starting your son in the way of life. At one time, I lived in OC, too.
Many of the places that I used to hunt may now be huge urbanizations - but, I will do my best with my memory. For rabbits, I used to go to the area below Silverwood Lake; tons of cottontails but watch out for Mojave Greens. There is some chuker on the foothills NE of Big Bear. Further up north along the Coast in the foothills Santa Maria (San Pedro Nat. Forest?), I used to see quail. Dove can be found over the mountains in the high desert (scout, and scout some more). Pheasants used to be around Salton Sea. Check out the Fish And Game website, they used to have some information on it. Good luck in your hunting.