A friend of mine is visiting California, and will be spending a few days in Napa to do some wine tasting. I understand there are probably tons, but could you recommend a few, let's say the ''not to be missed ones, or the whichever you would recommend first. If it helps, I would say nothing to high end, she is not a wine affcianado, just a ''bon vivant'' who drinks a lot of wine.
Looking at other threads, I'll add as a criteria that you don't need an appointment to go, and they will only two, so nothing that opens only for large groups.
Thanks in advance