We went to caravaning-4vents in Aug 2008, It was a delightfull site with clean toilets & shower blocks, swimming pool, bar & take-away in the evening (alfresco style), the pitchs are very big & have electric & water (although the water isnt advertised). Euro Disney is a easy 20 minute drive away. We bought tickets over the internet before we went, but we could have got them cheaper on the gate. (but tht might have been because they was celebrating 15 years) The campsite also offered tickets for sale as well. When you get to the disney ask for the fast track tickets as well, They are free but it gets you through some of the rides a lot quicker.
Hope this helps.
Cheers Stean
Have a great trip.