I recommend heading up towards Calistoga and hitting Sterling Vineyards. A tram ride takes you up to the vineyard and it has breathtaking views of the Napa valley. and their wine is _really_ good. If any of you guys (im assuming its all guys who were posting) are bringing girlfriends/wives, calistoga has some great spas, and their massages (especially any grapeseed wraps) are heaven!
ive always wanted to go to ravenswood vineyards. i think thats up in santa rosa.