This is a great site for finding Apple Orchards thorughout California. It lists orchards by region
Julian - east of San Diego
Oak Glen - East of Los Angeles
Tehachapi - near Bakersfield
North Coast - Sonoma and Mendocina area
Apple Hill - Placerville area
Paradise - near Chico
There's info about each orchard and what they sell with links to the actual orchards if they have a web page. Also info about apple festivals.
Oak Glen sounds interesting to me in my current location. But I just like the thought of going to Paradise.