Architectural Digest has an article that lists bike trips through scenic countryside. The article is about bicycle touring, but several of the routes could be travelled by motorcycle.
http://www.architecturaldigest.com/gallery/most-scenic-bike-routes-in-the-world
A couple of the routes listed:
Torres del Paine national park, Chile
North Sea Cycle Route, Norway
La Ruta de los Conquistadores, Costa Rica
Garden Route, Capetown South Africa
http://www.architecturaldigest.com/gallery/most-scenic-bike-routes-in-the-world
A couple of the routes listed:
Torres del Paine national park, Chile
North Sea Cycle Route, Norway
La Ruta de los Conquistadores, Costa Rica
Garden Route, Capetown South Africa