If I want to visit, how should I get there?

North on 280 to 19th Avenue, then to Park Presidio.  Right on Geary (after Golden Gate Park, before the Presidio).  Left on Commonwealth (after Arguello, before Masonic).  Left on California, then an immediate right on Cherry.  Turn left into the garage, and pray there is a space, or an attendant allowing double-parking inside the garage.  Most direct; best for non-commute hours.

OR:

North on 280 to Junipero Serra.  Veer right onto Portola.  Left on Claremont.  Veer right onto Dewey at the roundabout.  Left on Laguna Honda.  Right on Lincoln, then left on Kezar.  Veer right at the onramp just past Stanyan to enter the turn lane onto Stanyan northbound.  Right on Geary, then an immediate left onto Commonwealth, then as above.  Slightly more scenic; possibly better for commute hours, if you're a pessimist about 19th.

OR:

North on 280 to Brotherhood Way westbound.  Right on Lake Merced.  Right on Sunset.  Right on Lincoln.  Veer left onto Kezar, then as above.  Less stop-and-go than 19th; possibly better for commute hours.  Certainly better for the soul.

OR:

North on 101; follow the signs to Golden Gate Bridge/Van Ness. Left on Geary.  Right on Commonwealth (after Masonic; before Arguello), then as at top.  Most utilitarian; best for non-commute hours.

OR:

North on 280 to John Daly Blvd.  Right on Skyline.  Left onto Great Highway.  Follow Great Highway past Golden Gate Park until it turns into Geary, as it turns just past the Cliff House.  Left on Commonwealth, then as at top.  Most scenic; best for time only if you have no faith in the other routes above.  Good for the return route if you have the time for a scenic drive.  Reminds you why people live in San Francisco.

Return route tips:

Geary does not have a left turn onto 19th southbound, but California does.  When leaving via 19th Ave., take California westbound to 19th and turn left as though you have not a care in the world.  Leave Geary for the suckers.  However, California on the inbound route is a frustrated mess, so take Geary to Commonwealth for this purpose, as recommended.

If going home by 101, take Geary to Gough and then (and this is very important) ignore your GPS telling you to go to Market.  Instead, turn right onto Fell, and then left onto Octavia.  You'll want to be in the center of the roadway, between the two center medians.  (Media?)  This is only way to ensure you'll get on the fancy-schmancy Octavia onramp that replaced the old Central Freeway on- and off-ramps that your GPS probably still thinks are the bee's knees.