A megalithic ruin, built who knows when -- probably "hundreds of years before the dawn of time" -- the Stonehenge of Fair Oaks is not hard to find. Go to the Sunrise Area of the American River Parkway, walk east from the boat launch until you find an inconspicuous trail head on your right and follow it to the ruin.

Other than being a meet-up location for teenagers on four twenty and a canvass for taggers, the ruin has no discernible purpose. Conceivably, you could make a wish there and hope the ruin has special powers to make it come true. Dancing naked near the ruin sounds fun in the abstract, but it is not advisable due to its proximity to the fire road, which the rangers patrol frequently. It might be a nice spot for making out, assuming you haven't grown too jaded for such frivolity.  (I know many of you have, alas).  Patches of moss cover its east side; everyone knows that moss is conducive to romance.

Whatever purpose you give to the ruin, it awaits you in silence.  Life is fleeting.  Don't miss your chance to visit the Stonehenge of Fair Oaks.   

Postscript.
The writer does not understand why people spend time and money geocaching, but if he did he might hide a message for you that read, "I don't know about you, but I was dragged here by an Angel. Note: This Angel, who is now become a Devil, is my particular friend; we often read the Bible together in its infernal or diabolical sense, which the world shall have if they behave well.  So behave well."

You know, just to blow your mind.