These little guys, Anna's hummingbirds, are all over San Diego. Though they are small, they are reasonable aggressive and have been known to dive at those unwary individuals who enter their domain!
We came across this gentleman and his two friends riding mountain unicycles down the trail on Cowles Mountain at Mission Trails Regional Park. Looked to me like it took a lot of balancing skills!
This photo of Lake Murray was taken from the trail on Cowles Mountain. The trail is mostly reasonably easy to climb and presents beautiful views of the city.