Camping La Hallerais, Taden, near Dinan. It's about half an hour from the port. I've previously stayed there for four or five nights before going back. It's a nice big site with a pleasant walk down the river to the Port of Dinan where there are some good, reasonably priced restaurants where seafood is a speciality. There's a steep walk from the port area up to the old town of Dinan. Check out the reviews.
------------- jjg
Don't forget to leave a review of the French and other European campsites you have visited!
I rather enjoyed Camping des Chevrets, La Guimorais on the D201 West of St Malo. It's a brilliant drive back into St Malo along the coast road.
If you are leaving early in the morning beware that the toilet block iron gates lock on swinging shut and cannot be reopened without the key, leaving you locked inside while no else is up and about.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.