what to do downtown san francisco?
Fisherman's Wharf Golden Gate Park Coit Tower Presidio of San Francisco Crissy Field San Francisco Ferry Building Alcatraz Island Baker Beach Lombard Street Golden Gate Bridge
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 San Francisco was an early adopter of carsharing in America . The non profit City Carshare opened in 2001 . Zipcar closely followed . 

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 The city is also a landing point on three fiber optic cable systems linking the United States across the Pacific Ocean : C2C , Southern Cross Cable , and VSNL Transpacific . These cable landings , lower energy costs , and tax breaks led to a boom of data centers being built starting about 2010 . Data centers include those for Adobe , NetApp , Umpqua Bank , OHSU , and Fortune Data Centers . 

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 Urban planning projects in the 1950s and 1960s involved widespread destruction and redevelopment of west @-@ side neighborhoods and the construction of new freeways , of which only a series of short segments were built before being halted by citizen @-@ led opposition . The onset of containerization made San Francisco 's small piers obsolete , and cargo activity moved to the larger Port of Oakland . The city began to lose industrial jobs and turned to tourism as the most important segment of its economy . The suburbs experienced rapid growth , and San Francisco underwent significant demographic change , as large segments of the white population left the city , supplanted by an increasing wave of immigration from Asia and Latin America . From 1950 to 1980 , the city lost over 10 percent of its population . 

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 The Underground City ( officially RESO ) is the set of interconnected complexes ( both above and below ground ) in and around Downtown . 

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 Although the Financial District , Union Square , and Fisherman 's Wharf are well @-@ known around the world , San Francisco is also characterized by its numerous culturally rich streetscapes featuring mixed @-@ use neighborhoods anchored around central commercial corridors to which residents and visitors alike can walk . Because of these characteristics , San Francisco is ranked the second " most walkable " city in the U.S. by Walkscore.com. Many neighborhoods feature a mix of businesses , restaurants and venues that cater to both the daily needs of local residents while also serving many visitors and tourists . Some neighborhoods are dotted with boutiques , cafes and nightlife such as Union Street in Cow Hollow , 24th Street in Noe Valley , Valencia Street in the Mission , Grant Avenue in North Beach , and Irving Street in the Inner Sunset . This approach especially has influenced the continuing South of Market neighborhood redevelopment with businesses and neighborhood services rising alongside high @-@ rise residences . 
