You have a few recs for places people have eaten in the past. Also check Opentable which should have the list of restaurants serving Thanksgiving soon.
Last year Chow put together this list
I put together a list of Bay Area buffets
No guarantee they will still be serving this year.
Despite its name, the House of Prime Rib does a classic Thanksgiving dinner. I've been there three or four times over the years and will return again this year. For this one night they offer a turkey dinner with all of the expected side dishes. It's excellent.