Cache is located near but not in/on the ruins themselves. Byop or photolog.
Danger: Do not enter the ruin! This is an abandoned building that's crumbling. Should you decide to approach, it's at your own risk. The cache is OUTSIDE the ruins behind the sign. See spoiler photo.
You are stepping on to a 4x4 trail from the parking area.
Be aware, you're entering a dead/arid landscape. The area near GZ is surrounded by dead bushes, there's a narrow path but please be aware when approaching during summer, there may be snakes or scorpions (chances are you'll be fine but I wouldn't bring a dog or child here)
Parking in nearby kindergarten.
Upon arrival at GZ, you'll be standing next to what remains part of an old Arab village here in Yokneam, it used to be called Qamun (cumin, (the spice))
Here's an exceprt from Wikipediia on the area.
Thought to be the site of the Caananite royal city of Jokneam, during Roman rule in Israel millennia later, it was a city whose name is transcribed by Eusebius of Caesarea as Commons, and by Jerome, as Cimana (During the crusades, Caymun was a valuable fiefdom, granted to Balian of Ibelin by Saladin. Incorporated into the empires to rule Palestine that followed, it often was referred to by locals in conjunction with its neighbouring village, as Qira wa Qamun. The occupation of Qira and Qamun by pre-state Israeli forces on 1 March 1948 resulted in the depopulation of both villages.
Please see link for full article https://en.wikipedia.org/wiki/Qamun
Special thanks to Irisvo for assisting us with re-placement of cache.