I've been doing the Spring Fling Malibu for the past 2 or 3 years. It's a blast! There's easily like 40 Mopars. It gets a little hectic at first because the first leg you need to go up the 101 to finally get to Mulhulland and sometimes there's traffic on the 101. But after that, it's pretty cool going through the hills, then stopping at the Rock Store, then continuing on to Malibu. We stop on PCH and take pictures, then some continue on to the restaurant. Usually by then, I just head home because the traffic to Downey sucks!
