Ancient lava flows, deep gorges and spectacular waterfalls make Copper Falls State Park one of Wisconsin’s most scenic parks. Log buildings built by the Civilian Conservation Corps in the 1930s add to the park’s charm.  The park offers camping, hiking, bicycling, picnicking, fishing and swimming opportunities in Loon Lake. The 1.7-mile Doughboy’s Nature Trail, along the Bad River, is one of the best hikes in Wisconsin.

https://dnr.wisconsin.gov/topic/parks/copperfalls