trip to california

[joeyz6]

I was in San Luis Obispo last weekend for a couple of days (had a very nice '99 J. Lohr Cabernet), and I'm going back in August -- not only there, but also possibly to Napa for a day or two. First of all, has anyone toured any vineyards in SLO County? Paso Robles, for example? I'd appreciate any recommendations.
Also, is there an affordable way to get a taste of Napa? I have to admit, I am a little intimidated by it. When I went to vineyards in France, it was always so friendly and rustic, and usually free, although I admit I only went on two trips. I've heard that Napa is beautiful, but also commercial and expensive. But maybe that isn't true. Any advice on how a poor student can enjoy this region?
Also, if there are vineyards to visit that are in the areas of San Diego, LA, or closer to San Francisco than Napa, I would love any tips on those as well.
Thanks,
-Joe