The folks at Rouen Tourism have mapped two scenic routes incorporating historic manors and castles near Rouen, including some preferred roads and paths through agricultural spots.
Le Chemin de Gargantua. This 12km loop starts in Saint-Pierre-de-Varengeville, ~15 km northwest of Rouen. You’ll quickly come to the magnificent 19th century castle which houses the Center d’Art Contemporain de la Matmut. The route then takes you to the agricultural plateau, before joining the Austreberthe river and finally the Bois de la Fontaine by taking the “Gargantua path“. This name is linked to the presence on the banks of the Seine of two rocks representing the arm of a gigantic armchair in which, according to legend, the giant used to come to rest.