North Norfolk Coast Cycleway
The route starts off by following National Cycle Route 1 to Wells-next-the-Sea before the following the Quiet Lanes network of Northeast Norfolk, then heading down the coast to Great Yarmouth.
It's perfect for exploring the area that the Norfolk Coast Path passes through as well as the upcoming England Coast Path.
About gpx files
GPX is shorthand for GPS eXchange Format, It's a type of file that is a popular way of saving and exchanging routes.