The Simonside Hills in Northumberland National Park offer a fantastic circular walk up to the summit of Simonside, with stunning 360-degree views of the Cheviot Hills and the North Sea coastline. This moderate 4.5-mile hike takes about 3 hours and is perfect for spotting wildlife like red grouse, curlews, and even red squirrels in the forest below. Don't miss the chance to explore Little Church Rock and the prehistoric rock art along the way!