We spent a late evening this July climbing rocks in Mt. Diablo’s Rock City area. I had a couple of extra hikers with me because my teenaged Sister-in-law and her friend are staying with us for a week. Our intention was to scramble on some rocks for a while and then continue to drive up to the summit and the Juniper Camp trail, overlook. But the rock scramble was so much fun we just stayed there and enjoyed bouldering.