Just 15 minutes boat ride from Roscoff (8 euro adult return), Ile de Batz is a carless (as in no cars!) haven of abundant hortensia, stone cottages, boats bobbing in crystal clear water and great views in all directions. You can stay close to the boat landing and swim off the beach or seek out your own private corner far from the maddening....oops, getting carried away there.....it's calm, if the weather is nice it beats the cote d'azur, and there were several little places still available for rent (late july!). restaurants serve simple food (crepes, moules frites). If you don't bring a picnic they are very affordable, but there is one 'supermarche' where you can get the essentials i.e. bread, cheese, wine...Well worth a visit for a lazy day off the mainland.