Originally Posted by harleyrider
Personally I'd give Vannes a miss but if you head west from Vannes along the south coast of Brittany you should find the ancient standing stones of Carnac, the remote Quiberon peninsula, the lovely medieval town of Concarneau with it's walled city. Further along is the more modern seaside resort of Benodet. Lovely sandy beaches near Douarnanez, the wild coast line of the Crozon peninsula. East of Roscoff near Tregastel is the Pink Granite Coast with its unusual and fascinating rock formations. You won't get round all this in 3 days though.
Most of the municipal campsites will probably have closed by the end of September but I'm sure you'll find somewhere as those that are open shouldn't be too busy then.
I'm from there, and I have to fully agree. Skip Vannes, go to Quiberon. Crozon is simply amazing. From there, go inland a bit: Huelgoat is very nice, and the road to Morlaix is amazing. From Morlaix, take the road to Lannion. From there, you can head to Trébeurden, and go along the cost up to Perros-Guirec. In five days, you can cover that. Otherwise, from Roscoff: Montagnes noires, Pink granit cost, back to Roscoff. Depends if you want to ride on motorways all the time or not...
Almost forgetting: camping is dead easy. Just find a field, the path that leads to it, pitch your tent. Back roads are perfect for that. Watch out for the cops if you pitch the tent around petrol stations.
ps: As regard to the issue about rain: that's plainly misinformation. It only rains twice a year in Britanny. It just does so a bit longer than anywhere else.