You Found Cool Spot #4
Here is the clue to Cool Spot #5
Cool Spot #5 is basically adjacent to a major, old historic road in Los Altos Hills. There is one long named pathway named after a LAH pathways found Artemas Ginzton. This one named pathway segment goes from the very southern border of LAH to the very north border of Los Altos Hills.
Find the very south end start of this named path and look behind the named path sign for the next clue.