I'm sorry, but Big Oak Tree State Park is located in Missouri, not Wisconsin. The park is known for its huge trees, particularly the largest swamp oak tree in the United States. Visitors can enjoy hiking, fishing, and camping in the park. Other points of interest include the boardwalk over the swamp and the many bird species that live in the area. The best time to visit is in the spring or fall when the weather is mild and the trees are changing colors.