Being at the San Francisco end of the Bay Bridge and the heart of San Francisco's public transit network, there are extensive transit options to this district.
By ship
Two ferry companies offer special ferry service to Giants home games at AT&T Park: Golden Gate Ferry (http://goldengateferry.org/) from Larkspur, and Alameda Oakland Ferry (http://www.eastbayferry.c...) from Alameda and Oakland.
By Rail
Caltrain (http://www.caltrain.com/), a commuter rail line between San Jose and San Francisco, terminates at the Caltrain station at 4th & King Streets.
Bordered by Market Street on its northwest side, SoMa is within easy walking distance of all MUNI Metro (http://www.sfmta.com/cms/...) lines and the several BART (http://www.bart.gov/index.asp) lines which run under Market Street. Running on Market Street is the F-Line Streetcar which stops frequently on its route from the Castro to the Ferry Building, then north on the Embarcadero to Fisherman's Wharf.
Additionally, the MUNI Metro T-Third and N-Judah lines emerge from the Market Street subway and travel through the SoMa district, stopping at a few places along the Embarcadero south of Market, including AT&T Park. The N line stops at the Caltrain station, while the T line continues south down 3rd Street into Southeast San Francisco.
By car
The San Francisco-Oakland Bay Bridge, which is part of Interstate Highway 80, offers a direct connection from the cities of the East Bay area such as Oakland to SoMa. After getting into San Francisco, any of the first three exits Fremont/Folsom, 5th Street, 8th Street will lead you into SoMa before I-80 terminates at US-101.
From the south, there are two freeways running into SoMa: I-280 dead ends near the Caltrain Station - stay in the right lanes to get onto 6th Street, or stay in the left lanes to get onto King Street and past the Caltrain Station and AT&T Park. US-101 comes up from the south to merge into I-80, where you can get off onto I-80 and take one of the two eastbound exits into SoMa, or stay on US-101 stay in the left lanes and exit at 9th Street or Mission Street before the freeway terminates at Market Street US-101 continues north as Van Ness Avenue.
SoMa is also well-connected to other San Francisco neighborhoods by surface streets. From the north, The Embarcadero is the best one for getting down from Fisherman's Wharf, while Van Ness Avenue is the best for getting from the Golden Gate area. Between those two are a number of other major thoroughfares, such as Montgomery, Stockton and Hyde Streets, which will also do nicely. From the south and southwest, 3rd Street, Mission Street and Market Street all work well.
Parking here, as anywhere else in San Francisco, can be a challenge, but there a number of parking garages in the district, including a large one at Mission between Fifth and Fourth streets for the Moscone Center. People driving to a Giants game are advised to park at the large parking lot along 3rd Street just south of AT&T Park, just across the canal.
By bus
MUNI (http://www.sfmta.com/cms/...) offers extensive bus service through SoMa, with nearly every street having a bus line of some sort. Routes 10-Townsend, 20-Columbus, 30-Stockton, 45-Union/Stockton and 47-Van Ness are the best bets for getting down from the neighborhoods to the north, like Chinatown and Fisherman's Wharf. Routes 1-California, 5-Fulton, 6-Parnassus, 38-Geary and 71-Haight-Noriega are some of the best for getting in from eastern neighborhoods like The Avenues, while routes 9-San Bruno, 12-Folsom/Pacific, 14-Mission, 26-Valencia and 27-Bryant come up from Southern San Francisco through the Mission district.
Nearly all intercity bus service into San Francisco runs into SoMa, including Greyhound (http://www.greyhound.com/home/), MUNI, and various other Bay Area transit services AC Transit (http://www.actransit.org, samTrans (http://www.samtrans.com), Golden Gate Transit (http://www.goldengatetran...), and WestCAT (http://www.westcat.org/in...). Due to the current reconstruction of the Transbay Terminal, all this service currently goes to the Transbay Temporary Terminal (http://temporaryterminal.org/) at Main and Howard Streets. Facilities are minimal, with bus bays for Bay Area service on the Howard Street side of the terminal and on the streets surrounding the site, and Greyhound service on the Folsom Street side of the terminal.