Some of the 370Z guys did the Malibu canyons two weeks ago. They're really chill and nice. I met up w/ some of them at a previous meet, but didn't do any actual driving w/ them. They typically do a cruise a month and should have one coming up in Feb. For March, they're planning a cruise up to Ojai.
They're on their own forum and you can find their regional thread here:
http://www.the370z.com/southern-califor ... se-89.html
Here's a pic of their last Malibu canyon cruise.
