The Saturday Farmers Market At Ferry Plaza, outside of the Ferry Building Market is one of the premiere farmers market in the United States.  More variety and unfamiliar products than I've encountered at any other market.  Probably the best contact with the actual growers and producers.

On Saturdays the plaza is packed with both vendors and customers.  Best to get there early before the major crowds.  Plenty of breakfast choices, pancakes, nova, fresh shucked oysters, omelets, fresh orange juice and pastries.  No one walks away hungry.

Meyer lemons, persimmons, all sorts of figs, every citrus fruit known to California, brussel sprouts on the stem, wine grapes, knife sharpener, flowers, breads, cheeses, nuts, and free range everything.  Looking over it all, for reasons I don't totally understand, Mahatma Gandhi.