this is the actual location of the International Airport! (ok, not San Francisco City Proper) Since 2000, the Renovated Airport is really a Jewel in the Bay Area but since it is always foggy in the bay area, there are cases of flight delays due to it. The airport is composed of four terminals (1, 2, 3, and International) and seven concourses (A through G) arranged in a ring. Terminal 1 (Boarding Areas B and C), Terminal 3 (Boarding Areas E and F), and the International Terminal (Boarding Area A) handle domestic flights. The International Terminal (Boarding Areas A and G) handle international flights.
This is the Public Bus System of San Mateo County (areas like Daly City, San Mateo, South San Francisco, Milbrae, Redwood City, etc.) and also into portions of San Francisco and Palo Alto. Service is largely concentrated on the Bay side of the San Bruno Mountains. The only problem in Riding Sam Trans Buses is that they don't give you a 2 hour free transfer pass on changing buses unlike the San Francisco Muni.
Fare category Single ride Monthly Pass
Adult local† US$1.50 US$48
Adult local (boarding from San Francisco on routes 391, 292 and 397) US$3.00 US$72
Adult express US$4.00 US$128
Youth† (17 years and under) US$1.00 US$29
Youth (boarding from San Francisco on routes 391, 292 and 397) US$2.00
Youth express US$2.00
Senior and Disabled† US$0.75 US$22
Senior and Disabled (boarding from San Francisco on routes 391, 292 and 397) US$1.50
Senior and Disabled express US$2.00
BART operates in downtown San Francisco street, in the lower level of the Market Street Subway, below the Muni Metro trains. The system runs as far south of San Francisco as Milbrae, and, on the east side of the bay, serves Oakland, Berkeley, Richmond, Pittsburg, Bay Point, Dublin, Pleasanton, and Fremont. BART fares are priced by the distance you ride, and the system is more expensive than riding Muni. Therefore, it is not really designed for travel within downtown San Francisco. However, for reaching the city from the airports, or for travel to other locations in the Bay Area, it is a fast, cheap way to get to your destination.
prices are: example ar trip from balboa park to embarcadero is $ 1:45; Daly City to Oakland airport is $ 3.85
Although BART goes through South SF as well, CalTrain is faster and cheaper. There is one stop in town near the 101 and Grand Avenue. There is parking available for a nominal fee (I think $2), right next to the tracks. Walking, there's a nice business area basically adjacent to the station along Grand with restaurants, bars and shops. Note that you'll actually have to cross under the 101 and then walk across the street to reach it if coming from west of the tracks.