Easiest is connecting to Hwy 118 and exit Topanga Canyon Blvd in Chatsworth, head south for about 2 city blocks past one traffic light, u-turn and park roadside along the big brown rock formation with all the graffitti. Topanga Canyon Blvd exit is 8 miles from the 405 interchange if coming from the east, and the rock formation can be seen on the left off the far side of the highway as you approach the exit. Can also connect to Hwy 101 and exit Topanga Canyon Blvd and head north, but longer drive on local streets this way

NOTE: There are no porta-potties in or near the park (can the Access Fund help with this?), so take care of business before heading out the door. The gas and food establishments down the blvd will bluntly deny use of facilities and will in fact enjoy your crotch squirming desperation; very cruel and demented people thereabouts. There is a map here...