Well, we had the car, but we only used it once all week (went to Cap d'Agde, which had amusement parks etc.).
Needed to take bedding, tea towels, cloths, towels but pretty much everything else was provided, and there was a supermarket on site for food, plus a cheaper, bigger one not far down the road. Now I'm racking my brains trying to think of what the kitchen utensil was I really missed...something like a tin opener, but I can't remember, sorry.
The camp was great - very clean, well-equipped, the pool complex was massive. Our dds were tiny, so they went to the smallest Kids Club, but the older kids all seemed to be having a wonderful time, and other parents were pleased with it.
Lots of entertainment at the camp. The meals weren't as cheap as in, say, Spain, but not horrifyingly expensive either.
The local beach was lovely and I think in high season there's a funfair, water park, beach sports and all that kind of thing.