Oxnard - Mullin Museum (advance reservations required, but a phenomenal collection)
Mullin Automotive Museum: Celebrating the Art Deco Movement - Home
Camarillo - Kundensport (a working shop, but maybe they'll let you look at their current projects if you ask nicely)
KUNDENSPORT - Info | Facebook
Since you'll be there on Sunday, head down to Supercar Sunday in Woodland Hills. Featured marque on Oct 30 is Corvette, but there are always all kinds of goodies there regardless of the feature.
SuperCarSunday.com
If you're looking for a drive, the drive down PCH towards Zuma is great. That section of PCH shows up in countless television commercials. If you're adventurous, get a map and find Mulholland and some of the great roads in that area.
You can go the other direction and up into Ojai for some good roads as well.