Hi
From Cherbourg i would head for Granville then the Mont saint Michel which is well worth a visit, nearest village Beauvoir has an excellent friendly campsite. The route national roads are very good and quick but can be a bit flat and boring. I try to use the yellow D roads if not in a rush. I would suggest either follow the Atlantic coast down past Bordeaux to Biarritz. There are plenty of smaller interesting roads with the motorway always nearby if you want to make up time.
From Biarritz head for the Pyrenees, which is going to be the best bit of your trip! To make the return from Barcelona more interesting i would try to cross the Millau viaduct then head up the centre of France, loads of nice roads and interesting towns.
For campsites every small town and a lot of villages have a camping municipale in the town, usually walking distance to pubs, restos etc and very cheap. Good clean facilities run by the town hall. Just rock up and pitch your tents, the lady from the town hall will come and find you although many times i have left the money under a stone by the entrance. When arriving in a town just follow the brown signs with a tent, or signs to camping municipale.
If you end up near Blois give us a shout for  we would be happy to give you somewhere to crash, handy for the Chateau of the Loire valley if thats your thing. Alternatively i have a well stocked wine cellar!
Have a good trip.
Martin
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