You have found Cool Spot #5!
Now to search for Cool Spot #6!
Cool Spot #6 is a good hike from Cool Spot #5. It is located at the most northerly end of the Artemas Ginzton Trail which is now named the Wallace Stegner Pathway which closer to Page Mill Rd. You could hike all from the Cool Spot #5 to Cool Spot #6 on the same trail route. Look for the clue at Cool Spot #6 on the back of a similar sign that says Wallace Stegner Pathway.
There are some great sections of pathways connecting these two cool spots.
You will pass this Wallace Stegner Pathway sign on this LAH Recreation Trails route