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Almost all of the beautiful winter shots you have seen posted here of Yosemite did not require snow shoes. The beauty of Yosemite radiates from the road that loops through there with plenty of viewpoints to stop at. You will need snow chains though for your car to drive in there, though unless there has been fresh snow, you more than likely won't have to put them on, but you need to have them. Also, you need to dress warm. So keep that in mind for shooting Yosemite. Oh, and you won't miss not being able to get up to Glacier Point or driving Tioga Pass as there is so much to see in Valley, you will be kept plenty mesmerized. That is if you go there.
Myself, considering you won't have the warm clothes or snow chains, I would just work the coast, especially since you are already in SF. Head south to McWay Falls, etc. Head all the way down to Cambria, and stay in a place called "Cambria Pines Lodge" if you want to stay in a super cool lodge. A tour through Hearst castle can be interesting. But just working the coast line will keep you busy. Use one sunset with McWay Falls, use another sunset to shoot that keyhole at Julia Pfieffer State Beach. Just be sure to get directions to it, there are no signs off of the coast hwy telling you where to turn. So unless you know the turn off, it's easy to miss. And yeah, spend a day in Monteray, go to the aquarium there, it's a super cool place.
I think though you will have a blast no matter what you decide.