Anderson Valley has been putting out such great beer the past few years. The Boont is okay, but your right, the Summer Solstice is unreal.
Lagunitas brewing company out of Petaluma is incredible. Their "Undercover Shutdown" is one of the best god damn beers I have ever had. Any of the Anchor beers out of San Francisco are wonderful as well. Another good one to check out is Snowshoe Brewery from Arnold, CA. It might be a hard one for you to find, but its some of the best beer I have had from a micro-brew in California.