Off-Road Trails In Southern California?

Recently got into off-roading with my 2017 Frontier SV 4.0 L V6 4x4 and was hoping to find some local trails around the San Fernando Valley/ LA area. Anyone know of some good spots? Nothing too intense, more of an beginner/ intermediate in this area, looking to get better. The truck has a 2.5" leveling kit from rough country and SPC aftermarket UCA's and i'm in the process of getting some all-terrain tires. Any further upgrade recommendations? Rock Sliders, Bumpers, Skid Plates, Sway Bar Delete, E-Lockers?