On foot
If you enjoy walking, you can take the Historic F-line streetcar from downtown along the Embarcadero to Fisherman's Wharf, and walk along San Francisco Bay past Fort Mason — it's a bit of hill — to the Marina Green. If you're downtown, simply follow Van Ness Ave all the way north and take a left anywhere from California St to Lombard St.
By bus
Public transportation, provided by MUNI (http://www.sfmta.com/cms/...), is plentiful and frequent.
Cross town routes
The 28 bus gets you along Lombard St into Fort Mason from the Daly City BART station, traveling first a long way up 19th Ave and through the Presidio by the Golden Gate Bridge. Buses 29 and 43 traverse much of the western part of San Francisco before terminating in the area, with the 29 stopping in the Presidio and the 43 running through the Presidio before stopping in the Marina district. The 22 Fillmore bus 24-hour service from the 16th St BART Station goes north on Fillmore St all the way to the Marina Green.From downtown
From the Caltrain station, traveling through downtown past the Montgomery St BART station outbound or the Powell St BART station inbound, the 30 Stockton bus which runs about every 6 minutes during the day, until 1AM gets you to Chestnut St and near the Palace of Fine Arts. You can also take the 41, 45 both serve Union St, 76, and 12. Routes 1, 2, 3, and 4 serve Pacific Heights and Lower Pacific Heights.In addition to the many MUNI routes, there is also the free PresidiGo shuttle service with two lines: a Downtown line (http://www.presidio.gov/t...) that runs directly between the Transbay Terminal in downtown to the Presidio, and an Around the Park line (http://www.presidio.gov/d...) which runs throughout the Presidio.
By car
The main entryways are Van Ness Ave from the south and Bay St from the east. From the north and west, take Highway 101 through the Presidio to Lombard St. Chestnut St, one of the main shopping and restaurant streets, is one block north of Lombard St — parking is scarce and can sometimes take up to an hour to find. The best choice for parking may be the free area in Fort Mason, at Beach and Buchanan Sts, another 4 short blocks north of Chestnut. Union St, being Cow Hollow's main street, is three blocks south of Lombard St.