http://www.hobie3.org/

Since your without a boat right now your options are very open. If you chose to get a Hobie, your in the middle of a several active fleets.
The bay area is in Division 3. I used to live in Morgan Hill for a couple of years so I know the group and the area.

It's a very active and supportive group of people. If you wanted to learn more about multihulls contact them.