Entry is free at Muir Woods National Monument and San Francisco Maritime National Historical Park on Free Entrance Days in the National Parks. Expect more people and less parking than usual.

Cesar Chavez Holiday celebrates the life and work of the famous Mexican-American civil rights activist and union organizer with a parade leaving Dolores Park at 11 a.m. and ending at a street fair on 24th Street (from Treat to Bryant). Free.

Take the Polk Street Spring Wine Walk on Polk Street (from Post Street to Filbert Street) to sample wine and appetizers in shops. Repeats in August.