My husband and I are visiting San Francisco in September, and we want to spend a few days (no more than 3) in Napa/Sonoma. We think we want to do one night in each, but will that be enough? Should we do 2 nights in one and 1 night in the other? Which one would you suggest staying in longer if we decide to spend 2 nights in one area? Any suggestions on where to stay (we've been looking at AirBnB and will likely do that), where to eat, what to do? Any and all suggestions are appreciated, especially with regard to dining. TIA!