From Paris: motorway A6 to Lyon, then motorway A7 towards Avignon.
Then take the A8 "Autoroute du Soleil" (La Provençale), exit no. 36 at the Le Muy toll booth direction Fréjus/St Raphaël/Roquebrune sur Argens, then D7 to Roquebrune sur Argens, then D8 towards the Col du Bougnon/Les Issambres/San Peire.