Flight
Both Oakland (OAK) and San Francisco (SFO) are suitable options to fly into and are fairly equal distance. Pick whichever airport is more convenient for you.
Travel Note
There are a few inns in Fairfax; however, you will have better luck securing a hotel in the surrounding cities such as San Rafael, Novato, or Corte Madera. The Bride and her family will be staying at the AC Hotel San Rafael.