Tahoe + Napa + San Fran doable?

Napa is only about 45 min from San francisco, Tahoe is about 3.5 hrs from San francisco. Are you doing 2-3 days in each place, or total. If it's 2-3 days total, you will have way too much to do in that time. In December the snow in Tahoe might not be that bad.

Total of about a week, 2-3 days each place. I'd have to book a trip like this too far in advance to know what the weather would be like, so it sounds like driving wouldn't be a good idea. Any skiing around that area that I could access? Not married to Tahoe by any means.

2-3 days in each place is definitely manageable. The road could be a problem, but at worst you will just have to buy some tire chains, and that's usually only if there's a storm happening while you're driving. I had to do that driving to Tahoe in March. Really not a big deal.

Edit: and if you're going to ski anywhere , do it in Lake Tahoe, there are around 10 resorts to choose from. California snow has been hit or miss lately, so the conditions might not be good. If they are really bad you can just enjoy the beautiful sierras.

Not enough time for all.

Yes I have done this. We went to Napa and S.F. Then we drove to Tahoe for a couple of days. On the last day we drove from Tahoe to the S.F. airport. We did this in the summer but as long as the roads to Tahoe are not covered in snow it will be fine.

Tahoe can quickly get feet of snow, if you plan on doing tahoe try for mid week. Coming and going around a weekend can be an absolute mess getting up and down the mountain.

Trust me, oakland is a much better bet to fly home from than SFO. The lines through security are super short, and the airport isn't huge and is pretty nice.