Originally posted by: blipblop
Don't worry, I'm in my early 20's as well. As to fine dining explosion, have a read at this thread over at FlyerTalk. Check out all of the restaurants they mention in this thread.
Link
In regards to weather, the bay area and such usually have a micro climate as I have been told. The temperature would be in the 70's in August and at night might cool down to the 50's.
Will you be driving? I just ask because if you are going to be drinking a lot of wine, it may be better to get a driver and/or go on a tour so you don't endanger yourself and others on the road. We are going up there in a rental car and I'm not much of a drinker.