Betcha' didn't know this place was even here! The road continues on to a wildlife management area, but this cache is hidden well beforehand. The nearby bridge is a favorite place of mine to stargaze on a cool night, and is especially great during meteor showers.
The road is paved here, and a nice turnaround is just across from GZ.
Just before GZ is the I-12 overpass. It's beautiful at night watching the lights come and go. Get this one at night if you can. It's not impossible, and might be worth the hunt!