The lush greenery and sparkling streams of White Clay Creek State Park offer a refreshing change of pace from the encroaching urban development of New Castle County. Whether it’s an activity at the Carpenter Recreation Area, a retreat into the pristine White Clay Creek Preserve, a hike along the peaceful trails of Possum Hill, or just a few hours of fishing in the creek, visitors of all ages will enjoy the natural beauty of the White Clay Valley. Hiking Trails: Of the many activities available at the park, hiking is one of the most popular. Twenty miles of trails lead explorers to scenic vistas overlooking lush valleys and impressive rock outcrops. Explore the Millstone Trail where grindstones were once quarried from the exposed boulders or get an active workout on the Lifecourse Fitness Trail.