Willow River State Park in Hudson, Wisconsin Post author: Post published: Post category:Hike / North America / USA / Wisconsin Waterfalls, caves, and frogs for these little explorers. A great day outdoors at Willow River State Park in Wisconsin! You Might Also Like Hiking Minnesota: Shovel Point on the North Shore of Lake Superior in Autumn A Weekend in Duluth, Minnesota July 4th in Stillwater, Minnesota