A 2nd vote for Dinard. Cross to Cherbourg, then head South West (keeping south of the nuclear power station prohibited zone), and you arrive over the Cottentin oyster beds.
You can safely fly along the coast very low indeed - just watch out for seagulls below 500ft. If the engine fails, slow down, flaps out and land anywhere (if the tide is out!).
Pass Granville, and climb to 3000ft to circle the Mont St Michel, from where it's just a short flight to Dinard. The tower closes for lunch. There's a nice bar / restaurant with a very friendly lady who helped me find a campsite when I was there (that was after she'd spent 20 mins calling all the hotels, which were full).
The town of Dinard is nice, with some excellent restaurants.