Eurocamp can be pricey. Take a look at Venue Holidays as they tend to be better value. We just stayed with them at a site near Venice and had a great time. [www.venueholidays.com
In the south of France we've stayed at this place [www.lapascalinette.com
] (arranged directly with campsite) and really liked it - not too big, lovely pool and waterslides and a short drive to beaches, supermarket etc. We're going back this summer at the end of August - prices get cheaper from the last weekend of August onwards.