Peninsula State Park in Door County, Wisconsin, stretches along eight miles of Green Bay shoreline and ranks as the state’s third largest and one of its busiest parks. Chosen after a 1908 site tour and established in 1909, it was created as an affordable public retreat, with early development focused on roads, lookouts, campgrounds, and golf despite a small budget. Over time it grew into a major Midwest destination while reflecting debates over conservation and park development. Its notable features include Eagle Bluff Light, observation towers, Horseshoe Island, extensive camping and trails, golf, a nature center, and Northern Sky Theater.