This cache will take you near an old treehouse just west of GZ. The treehouse has 3 levels to it and I first found it 14 years ago. It's atleast 20 years old. My friends and I put a big flag on a flagpole with our nicknames on it on the nearby hill when we were 12 years old. You were able to see the flag from our school field, pelona vista park and the freeway.
Parking on Barbara Ln. I made the hike in 6 minutes and 12 round-trip. 5 more minute hike to the nearby earth cache. Although the trip has a good incline, most vehicles can get near GZ just fine. Follow the trail or the telephone poles, either one takes about the same amount of time.
You are looking for a bison tube.
Congrats to W01f for FTF