Camarillo or Oxnard are the closest. Its probably going to be easier to find transient parking at Oxnard. Fromthere ist just a jaunt over the 101 to the 23 north. A more leasiurly, scenic route would be to take the 118 eastbound through the farmland. Santa Paula is most likley the closest...as the crow flies, but you got to cross a ridgeline to get to the 118 through Grimes Canyon and that drive is a slow, twisty ride.