We are thinking of the Ile De Re. We do camp, but probably more inclined to glamping. I don't like places with loud annoying entertainment - European all inclusive resorts filled with bus loads of Brits abroad are my idea of hell.
So
(1) where is good to stay - we have two kids (3 and 5) so self catering with options to BBQ and die from over carb consumption is better than a hotel
(2) We're likely getting the overnight ferry from Portsmouth to St Malo. I think we'd like to see Mont St Michel so I am anticipating an overnight stop on the way. Any ideas?