There is the Nueva School in SF, which is a great school for the gifted. The Harker School in San Jose is another great school. There are also GATE programs at alot of the top public schools in the SF Bay area. Lowell HS is a phenomenal public school in SF. There are lots and lots of G/T programming opportunities in the Bay area!
I am so jealous- we don't have those kinds of things and just cobble things together best as we can.