From the Lombard Street Gate, the Presidio Promenade Trail winds it's way past multiple historic sites within the San Francisco Presidio continuing to its terminus by the west battery bluffs by the Golden Gate Bridge visitor center above Fort Point. Check out => http://www.presidio.gov/explore/trails/Pages/presidio-promenade.aspx#.UmycXDK9KSN for more information.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.