Wow... you guys talked about the 101 in Ventura... nice to hear it mentioned. I grew up in Moorpark, so we'd go to the Simi Valley Drive in and on rare occasions drive to Ventura. My sister lives in Lompoc and the old screen for that drive in is still there, although the land it's on is a gravel company or something. What great memories.
The Simi Valley drive in was in a scene in a Janet Jackson movie, I can't remember the title, but at least one can still catch a glimpse of it.