Last went about 2 years ago, and my unscientific recollection is that there were 100+ cars.
Here's a link to someone else's pics I found from a few years ago.
http://www.jalopyjournal.com/forum/show ... p?t=395514
Camping on the water? Kinda-sorta. There's an RV campground not too far away. A little further up 101, you can RV camp but it's more or less a frontage road not too far off the 101, along with the road noise that comes along with it.
There's camping along the beach south of Mugu rock, but there you're right off of PCH and its road noise, though it should be much less than the 101 noise.
Herb