Other than mushrooms, the most noteworthy nature things were an abundance of noisy great blue herons, and one bird that I really wish I knew what it was. It was hiding along the lake shore like a heron, and making some noises that were vaguely heron-like. I only saw it briefly as it flew. I'm confident it wasn't a green heron, and it was definitely not big enough to be a great blue. Because as it flew away, I had the distinct impression of yellow on the outside edges of its wings and/or tail. Would a night heron show yellow as it flew?
I also found a lovely flicker feather on the path. (I picked it up to admire it, and then set it on a weed beside the path where someone else might be more likely to see it than step on it.)