Mare Island is a neat historic place to visit, to learn more of what’s happening check this site http://www.mareislandhpf.org/news.html . Building 46 houses Mare Island Historic Park Foundation Artifacts Museum. This building built in 1855 had many uses and one of them was a former pipe shop until 1984.
For more information about tours or Mare Island Historic Park Foundation Artifacts Museum, http://www.mareislandhpf.org/museum.html
Angels do know! 