Hikers, horseback riders, and leaf peepers will want to move Indiana’s Brown County State Park to the top of their must-visit list.Sunset over Brown County State Park.Credit: Indiana Destination Development CorporationKey PointsBrown County State Park in Indiana offers scenic vistas, hiking, biking, and horseback riding across nearly 16,000 acres of forested hills known as the “Little Smokies.”It’s a popular fall destination thanks to its vibran…