I thought that was just the bee's knees, until I was up at Jones Park last weekend and discovered this kid-made structure:
Above is the fire pit area. It's about four feet tall and ten feet long. In front of it is the barricade (below). Note the "windows" in both the barricade and the fire pit wall. They also built stone chairs and pathways all along the creek.
And that sign in the bottom left of the photo above? Here's a close-up:
Is that great or what? I remember my pale efforts at forts as a child and feel ashamed. These kids rock (literally).