This weekend in the arts: art at two parks for Park Social; "Posters of Optimism" at Art Produce; Bach Collegium; Community Fest (and "Purple Rain" screening) at UC San Diego's new amphitheater; free opera for kids and more.
Embark on these "secret" passageways between fascinating and historic neighborhoods, across thickly vegetated canyons and safely above multiple lanes of traffic whizzing below.