I knew I was getting close to my goal, but became aware of a large number of people around me, and stopped, not wanting to walk into any of them. It turned out to be a tour group. I listened to the guide talk about the magnolia that he was gesturing at, and tried to figure out where it might be. I noticed that you can hear trees. If there's even a little bit of wind, you can hear from the rustling not only where a tree is, but how tall it is, and I imagine that with some practice you could get an idea of what kind it is by the sound its leaves make. As the wind picked up, I could perceive trees all around me, and I felt like a bat using echolocation to navigate.