The day after the 4th of July, I went for a hike to Mt. Diablo, California. The entire summit trail is 8Km one-way. I hiked up to the end of the staircase trail which is ~3Km one-way from the summit trailhead.
The view from the top of the sentinel rock. 
The elephant rock formation. 
The view from the top of the staircase trail. 