Although the Write Out project (now underway for the next two weeks) is supported by the National Park Service, through a partnership with the National Writing Project, there is no mandate that you have to explore a park. Not many of us have a National Park nearby.
Your backyard or school yard or city block or neighborhood will work just fine. Here, I created a small digital piece about surfacing the stories of the past of my small village neighborhood. I created it in SoundSlides, and you can go there directly if you want to see my piece.
Peace (in the walk around the block),