Last weekend was cool, but sunny. A friend and I took a hike in the East Bay hills, in the Sibley Volcanic Regional Preserve. From the top you can stand in one spot and see San Francisco, Mt. Tamalpais in Marin, and Mt. Diablo to the East all at the same time. That’s hard to do from the ground!
The park is the site of several small dormant volcanos and an old rock quarry. It’s a geologist’s dream. There are also at least four man-made rock and grass labyrinths. Here is a view looking down on one, with the Bay and Mt. Tam in the distance.