About 20 years ago there was a cross country ski trail near my house. I frequently went on it about 9:00 PM. It was about a 1 hour loop. Several times there was a police cruiser waiting for me when I got back. They never talked to me once they saw that I was on skis. It was near the runway of the airport so there was enough light to see if you knew where the trail went. It was a very enjoyable exercise. There were a few homeless folks camping in the area but they were long term and everyone knew about them and they never bothered anyone.