Labyrinths seem to be popping up all around the Bay Area. The latest we’ve heard about is in Napa’s Robert Louis Stevenson State Park where this Saturday from 10-2 there will be a guided hike, and for those interested, a continuing 4-mile trek, including a geology talk, to Table Rock. The trail is rocky so bring good shoes and if it gets hot, a sun-resistant hat. Free. Sign up through Eventbrite.