There's something quite out of place at GZ. This spot used to be the final for a puzzle cache, but the puzzle was archived due to loss of the signs that contained clues to the final. If you've found the puzzle while it was live, you'll know what I'm talking about, and you should have an easy find.
I'd be interested in your opinion as to how the attachment device came to be where it is.
The cache is magnetic, but then again...
The cache is just off a very popular trail, so stealth is advised. A lot of locals walk their dogs and themselves here on cool summer evenings. If you have time, walk farther up the trail to see some nice views, and read the informational signs at the Alpine Lane parking area.