Interstate State Park, Wisconsin's oldest, faces off across the St. Croix River with Minnesota's Interstate State Park. Both offer cool hikes past rocky glacial potholes, but the larger Wisconsin park (50 miles northeast of Saint Paul) also has a large swimming lake, a heron rookery, a wildlife trail and naturalist-led hikes in the summer. If you want to visit both, the US-8 bridge links the parks. (715) 483-3747
Interstate State Park
Wisconsin Department of Tourism
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