As no one else has been along with any suggestions, can I make another? Get hold of the Eurocamp and Canvas Holidays brochure - they offer sites with lots going on - and you can see at a glance what is available. If there's anything you fancy then come back on here, and ask - I'm sure there'll be someone who's been already!
Bois de Bardelet near Gien, on the Loire, is another site with plenty going on - and good pitches (but beware the take-away unless it's changed hands!!)