If You Want An Island Getaway,

that is not to far from civilisation, 

photography by Aerial Canvas found on Spaces, this could be the island for you, it is the only private island in the San Francisco Bay,

this private island goes by the name of Red Rock Island, it was a site for manganese mining, and abandoned mining tunnels still exist, along with the coast guard’s old fog bell, now totally deserted it is up for sale,

the island has a few trails, but no buildings of any kind, 

the agent comments, ‘Prospective buyers have the option to maintain the island’s natural state or embark on their dream development project,’ who are now listing the San Francisco property for $25m, before buying it might be an idea if you want to live there to find out about what in the UK we would call ‘planning permission’ with my luck I would have bought it to build a dream home only to then found out buildings and living there are not allowed!, the agent is here.