Concord has an airport that used to have daily nonstops. A plane crash into a mall and assorted NIMBY's have closed it to daily scheduled commercial traffic, but it's still perfectly capable.
Watsonville has an airport with plenty of room to better serve south bay and Santa Cruz.
Moffett, of course.
Even San Carlos has an airport with a fair amount of general aviation traffic.
Hayward Executive always looms when I fly into Oakland- it looks more than big enough.
Livermore, Novato, Palo Alto (busiest general aviation airport in the country), the list goes on.
Frankly just getting Concord back into the act would be tremendously difficult. My definition of "good places" differs somewhat from those in power, but that may slowly be changing.