This guy was in the middle of the path, in the blazing sun. I don't know what he was thinking.
I was clearly a "casual" visitor, without a great big lens, or even a hat, and felt strangely out of place for not carrying a tripod. Everyone else was fully equipped. The bright sun made it hard (for me) to photograph the flora, but it was there. Much of it, sadly, undesirable, like the Japanese knotweed that was strangling the native yucca in a picturesque, spiralling manner.
If it ever stops raining this summer, I recommend you visit the refuge, which is part of the Gateway National Recreation Area. There's an informative and well-equipped visitor center, the trails are easy for people of all ages and abilities, and it's free. Oh, and bring your camera.