A brief walk south from the Ferry Building brings along the former site docks for boat building, ship repair and the Pacific Mail Steamship Co- the global connection ca 1871.
Mission Creek connects San Francisco Bay, by what was in early days a navigable route, almost to Mission Dolores. Today, a marina with houseboats and condominiums, just adjacent to the ballpark.
From the bay to Mission Dolores inland, mostly marsh and mudflats and creeks and often grizzly bears. The herons and the creek are the living connection to that environment.
http://explore. R a museumca.org/creeks/1640-RescMission.html