How serious are you about wine? Are you going to want to visit high-end, by-appointment wineries over a couple of days or will you be happy with a more mainstream tour? Are you going to want to see more things in the Napa area on Sunday, or would you rather spend that time in San Francisco? A third alternative is that since most wineries close at 5, 6 at the latest, it's quite possible to rent a car, visit some wineries, have an early-ish dinner and drive back to the city.
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