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Various officers' quarters, plus Saint Peter's Chapel. Most buildings are only accessible to the customers of the renting businesses, if rented for an event, or as part of a tour. See The Quarters Coffee House under Eat for a historic building business anyone can enter daily.
Parts of southern Mare Island have been preserved as a park that features many historical sites of the former Naval base, such as the Naval graveyard, a reservoir used to water that part of the island. Its main feature is the converted roads that bikes and pedestrians use to climb to the highest point of the island, and enjoy views of seven Bay Area counties.
Operated by the Mare Island Historical Preserve, this walking trail is an escape into the quiet and peaceful wetlands of Mare Island's western shores. After being closed to the public for over a century, this four-mile collection of flat walking trails comes not only with the views you see in a wildlife preserve, but also of places such as San Pablo Bay, Mt. Diablo, the Carquinez Strait, the East Bay hills, Mt. Tamalpais and the Sonoma and Napa Valleys. Because the trail is only to be used by humans on foot, there is a rack to park your bike in the parking lot.