Del Valley is a Regional Park in Livermore, California. There are lots of hiking trails where one can hike all day long. There is also a small lake (water reservoir), just beyond the hill top. If you look close you will see the trail going up the hill side.
At ground level, the tress are showing their fall colors. Not a lot of fall colors but enough to see the transition from green to gold leaves. The grass is still gold, but not for long as soon the rain will come and green grass will be dominant.