It is actually a large park

 I walked farther away from the road and saw what looked like an observatory on a hill. Also it became obvious that the park was very large and what I saw in yesterday's pictures was merely the entrance to the main park.

  This map shows the area around the park. You can see that there is a lot of water in the area.

All of a sudden I left a wooded area and found myself walking along the shore of a large lake.