does anyone know of farms that will do tours this weekend, or at least in general? the ones i've found on the sites i've visited aren't updated too often. actually, anything food-related and in marin/north bay would probably be okay too, at least for today or tomorrow.
Harley Farms does a fantastic tour of their dairy. They specialize in Chevre at an organic, sustainable dairy in Pescadero. Super nice people. The tour is 2 hours long and you get to go into the holding pens to meet the goats, try your hand at milking, go into the cheese making room to see that process and enjoy a generous sampling of cheeses.
Things don't change that much down on the farm, so old reports are probably still good. You might check out the Sonoma County farm trails site which will give info on any tours.
IIRC, there is an apiary in there that has a tour but don't recall the the hours. Look in Santa Rosa on that site, I think there is some stuff there.
I don't know how good or bad it is but in the winter Viansa Winery does a tour of the 90-acre wetlands area reclaimed by Sam Sebastiani with the help of Ducks Unlimited that the winery overlooks. That's according to a SF Chronicle article, but I'd give them a call since I don't see anything about it on the site ... not a farm ... but still ...
One of the wineries on my map of the city of Sonoma does a tour of the vinyards on the weekends, but I'm not sure which winery. But you can look through these to see if you can find it if you are interested.
Note: these are wineries for the county of sonoma, only the city.
Might be a rough weekend for a tour with the impending Christmas holiday. Wherever you go, hope you report back so we have some current info.