No puzzle here.. Just park at the posted coordinates, proceed inside (10-8 M-W, 10-5 Thu-Sat), and retrieve stage two, shown below:
If the picture doesn't show up or doesn't look right, hit reload. Don't ask about the cache at the desk; they don't know anything. The final is a short drive away.
This cache is similar to recently archived puzzle of mine, stage one.
If you get stuck, get a hint here.