Brings back memeories, last time I used Eurocamp was June 1989, went witht he kids the old fella and my brother and his family. Its changed dramatically no doubt.
You could book up virtually every western European country except Holland, you could even book up most of scandanavia. We did Normandy, Houlgate - La Plage which had German fortifications from the D-day landings and direct access to the landing beaches. 4 days there.
Penestin Les Iles Southern Brittany 6 days.
St Hilliare de riaz Vendee 6 days.
I enjoyed Normandy the most, purely for the D-day landings and the people were nicer too.
All set up and the sites were excellent. Used to get a local OS map for each site area, departed ferry Brittany Ferry Portsmouth to Caen. All changed now so its not much use for you...sorry