I had a strange thing happen at Spirit Mound. I parked in the parking area and started on the trail. Right after I started walking, a red pick-up pulled up and parked. You can see the parking area from nearly everywhere on the trail, so for some reason I kept an eye out. I had my camera and was really taking my time on the hike. I never saw anyone from the truck start on the trail. I must have been walking for a good 30-40 minutes (I was admiring the birds, flowers etc)
When I got back there was a guy near the pickup. It didn't seem right so I got right in my car and locked the doors. He came over to my car so I cracked the window and he said "So, what do you think of your Prius" so I answered his question and a couple others about the car, but didn't open the window. As soon as I pulled out of the parking lot. He left.
It's probably nothing, but being in the middle of nowhere and being the only one on the trail it was a bit offputting. The walk itself was great