LAst year I caught the Ferry from Portsmouth to StMalo and spent a week along the brittany coast.
The N12 is the most boring camera infested road you can ride, I can firmly recommend the coast road from StMalo to StBrieuc, then the highlight of my trip and if you miss it out and go the N12 it would be sacrilidge.
Follow the coast road from Pordic to Perros Guirec then take in the beaches from Perros-Guirec to Tregastel to Trebeurden.
Below are some of the photos of that little areas, its really not to be missed, silky smooth twisty roads and perfect beaches.
I cant remember which beach is which but this is what you are missing.
The Roads on that you will miss.
I would love to go again, alas this year I doubt I could afford it with other plans.