Jablines

Excellent!
Good size pitches with hedges between pitches and clear 'roads'. Small play area. Good washing areas. Very nice, helpful staff. A decent little shop (nice to send the dc off in the morning to buy fresh croissants).
Convenient for daytrips by train to Paris.
Very convenient for Eurodisney. The Paris train leaves from the Eurodisney stop, which is 15min car journey from the campsite.
A lovely artificial lake nearby with lots of watersports and swimming.
Country park with lots of walking. Cycle hire and horseriding also available, but we didn't do that.
Only criticism is that the pitches are heavily used, so by the summer holidays they are very worn and stoney. Take an extra groundsheet along to put underneath your tent to protect your sewn-in groundsheet.

Excellent campsite. Pitches very worn by the end of the summer, but spacious and well laid-out. Playground and shop, helpful staff. Good washing facilities. Set in a large Parc des Loisiers, with lake (beach), watersports, cycle hire, and more. 15mins car journey from Eurodisney. Park at Eurodisney and take RER into Paris for a day trip.