Sea captains and captains of commerce, the old haunts of the Barbary Coast and an island with worldly airs yield a bounty of fun. Lined with deep-water piers, The Embarcadero is literally where one embarks. And, oh, “the places you’ll go!” At the foot of Market Street, is the Ferry Building, a vibrant public space housing a food hall, restaurants and a farmers market. The Ferry Building is also the terminal for ferries to Marin County, Vallejo, Oakland and Alameda. Piers 7 and 14 offer vistas of the skyscrapers of the Financial District and the San Francisco-Oakland Bay Bridge. The Exploratorium, a “21st century learning laboratory”, engages all ages at its new home on Pier 15. Across the bay is Treasure Island, a man-made island that was the site of the 1939 Golden Gate International Exposition. Jackson Square, one of 11 historic districts, has many buildings dating from the mid-1800s - some of which are supported by old ships masts.