We took a trip to San Francisco recently, taking advantage of the nice weather to ride the Ferry from Vallejo to SF. With our senior discount, it only cost us about $9 each. and was a beautiful trip both ways.
It sure beats driving in traffic, finding a place to park, paying tolls and parking fees, etc. And like we said, the views were wonderful. That's a panorama of the bay from near Pier 39 above. And here's a closer shot of Alcatraz.