The Official Route in this guide is a former alignment. Current alignments have the trail over 350 miles and will eventually be 500 miles.
A work in progress starting from the corner of Jefferson and Hyde Streets it is possible to circumnavigate San Francisco Bay via a network of trails. Check out => http://www.baytrail.org/pdfs/BayTrail-Brochure.pdf
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.