Bay seniors wary of visiting the Point Bonita lighthouse in the Marin Headlands because of its rocking, rusting bridge, will be relieved to know it has been replaced. The new suspension bridge sways a bit in the wind but it’s nothing to get alarmed about.This working lighthouse was built in 1877 on a basalt ledge 124 feet above the boiling Pacific surf. You still walk through a tunnel carved in 1876 by Chinese laborers before you cross the bridge. The lighthouse is only open on Saturday, Sunday and Monday from 12:30 to 3:30. Docents will answer any questions you have. Nearby you can check out the 1905 Medella Battery and the overlook at Bird Island which flocks of pelicans call home.