Crossland Moor (Huddersfield) is an unlicensed strip on the top of the Pennines with views for miles all around, not quite on the Pennine Way, but still loads of good walking to be done nearby (and some good beer). Peak National Park boundary is 2 miles away - footpath through the middle of the airfield. For walking on the North Yorkshire moors, try Bagby (near Thirsk).
For me, it'd have to be Scotland though.