For those who use the Presidio, specifically Lincoln Blvd and Crissy Field, regularly see the following link. There is a number of detours taking effect soon that will be in place for 18 months or more. Eventually, these will result in fantastic improvements in the area - both for circulation and for aesthetics. Until then, it'll be a challenge. In particular, note that Marina Blvd (used for access to such things as La Petite Baleen, Planet Granite, Sports Basement, Ft. Point, etc.) will be taking motor vehicle traffic that ordinarily uses Lincoln Blvd for access to the Bridge.
Wheel Kids Bicycle Club, Inc.