rom Paris (486 km): A11 motorway to Le Mans then A81 to Rennes. Then take the N24 to Ploermel and the N166 to Vannes.
Then the D780 towards Nantes, exit "Presqu'île de Rhuys/Sarzeau/Port du Crouesty" (commune d'Arzon).
A11 Autoroute de l'Ouest to Nantes. Then take the N165 to Muzillac then the D20 towards Sarzeau and the D780 to Port du Crouesty/Arzon.