Bay seniors know that not too many historic City sites are hidden at this point, but South Park between Downtown and the Ballpark keeps ducking under the radar. You can explore its rich history this Sunday May 31 at 1:30 pm with one of the best San Francisco City Guides walking tours. Built around a private oval park in 1885 it was the City’s first planned community with the first paved streets and sidewalks. The homes and hotels there were residences for wealthy citizens who moved away when Nob Hill became habitable. It also thrived as an early Japanese-American community and stayed in the shadows until the recent dotcom booms. Free.