My Mom and I sometimes ride the Larkspur ferry to go into San Francisco. There are stories of Middle Eastern men trying to take video recordings of inside the ferry bridge. they act like they're casing out the boat. No one checks anyone's bags or anything. They could carry a bomb on board and no one would know. Terrorists could also hijack the ferry. They might ram it into the bridge or maybe Pier 39 with explosives onboard. there are lots of tourists who visit the GG Bridge and Pier 39.
Husband is captain in the Bay. He has had armed sea marshalls riding with him on and off since September. Lots of security July 4.
When you ride the ferries keep your eyes open, report anything thing that looks suspicious. I know of one incident where two ME women were acting strange, they were reported to the FBI. Tell the deckhands, tell the captain.
It would take alot of explosives to damage the GGB. I'm more worried about the toll increases!!