From Paris :
Take the A14 towards Rouen and then join the A13 following signs to Rouen / Le Havre / Caen.
Exit at Pont Audemer and go through Bourneville.
Head towards Pont Audemer and join the Chemin de la Vallée to Saint Opportune la Mare.

From Honfleur :
Take the D580 towards Beuzeville / Pont Audemer / Bridge Tancarville
Arrive at the roundabout "Relais du Pont de Normandie" and turn left on to the D312 via Conteville and follow signs to Pont Audemer.
Turn left on to the D810, then take the Chemin de la Vallée and continue on the Chemin du Quai de Forge.