They are working on the path and bridge to the lighthouse
And some of us nervous nellies think that's a good thing.
Above and below is a photo from about 1870 by Eadweard Muybridge of the path to the lighthouse before there was a tunnel.
Here's a 1940 photo of the path then.
Several photographs of the area were published in stereocards from about 1865 to 1910.
Here's a view of the point about 1865. It's taken from the city side looking out towards the Golden Gate. That might be a grounded ship in the foreground.
"Light House looking South"
Another photo of the path to the lighthouse.