I was thinking 80 acres is not that much land to get lost in. However, if they have no livestock the undergrowth could be pretty thick and they may not have fences or right-of-ways that you would eventually get to.
My brother and I wondered around my Grandpa's land (70 acres) when I was a kid. However, you didn't have to go very far before you hit a fence and there were cow trails through the undergrowth you could follow that would take you back to the water trough and hay barn. If most of the 80 acres was unmanaged I can see it would be pretty disorienting to young kids once they got a couple hundred yards into it.