| I've only skimmed, so don't know if this suggestion would work.
If the idea is to visit California, consider visiting San Diego area instead of SF area. Then do the wine country tour in Baja California, Mexico. Drinking age is 18. We have a winter home there and we have taken every visiting set of friends on a Ruto del Vino tour and all have loved it. Drive time from San Diego to the wine country is probably about 1 1/2 hours, but allow two. Drive time on the return would be longer, as the border crossing is a big traffic jam -going north back into the US; no problem going south into Mexico - (to put it mildly).
PM me if you want more details re specific wineries, etc. |