Devil's Lake was the most visited, with 2.4 million visitors, followed by Kettle Moraine State Forest-Southern Unit and Peninsula State Park.

Peninsula State Park in Fish Creek, Wis. Big Bend Ranch State Park in Terlingua, Texas Lost Dutchman State Park in Apache Junction, Ariz. Stephen C. Foster State Park in Fargo, Ga.

Celebrate National Trails Day with some of the best hikes in the U.S.—from slot canyons to grassland wanders to secluded beaches. Published: May 29, 2025 Updated: May 29, 2025 ...