Well, since you live in Southern California there are loads of options.
The beach is the obvious one (i.e. the Gay beach - Black's beach, etc.)
I don't know your religious beliefs but Church is a great place to meet guys.
The supermarket never fails (Gelsons, Whole Foods, etc.)
There are clubs for everything imaginable (i.e. wine, knitting, baseball, wrestling, ad nauseum).
Politics is a good one. Getting involved in GLBT outreach for a political candidate is a lot of fun.
There is the Hollywood community center that offers opportunities for different meetings, mentoring, etc.
Almost forgot the Gay Mens Chorus and other arts organizations.
Highways is cool if you are performance oriented.
In Southern Calfornia anything you can imagine is available Gay flavored.
Frontiers Magazine has listings for lots of clubs, organizations, and events.
Your tagline "Finding that guy off Santa Monica Blvd." makes me recall a story that still makes me laugh.
Eons ago it used to be great fun to drive down Santa Monica Blvd. (the area around Yukon Mining and the Formosa) and watch the street hustlers (you can see this in films like Hustler White).
My friend John had a beautiful 1951 Buick Super Convertible that he fully restored. It had ten layers of lacquer.
Anyway, one summer night we were headed west on Santa Monica in that car with the top down. We pulled up to an intersection in the center lane (right around Paramount). Next to us in the curb lane was some Chrysler K car convertible with some smart ass who was talking to the very cheeky working boy on the corner.
K car asked "How big is your dick" and working boy, without missing a beat, replied "bigger than your wallet".