Best holiday camp for a 4 and a 7 year old - South Brittany

[SweetDCofMine]

Completely new to this type of holiday, don't know where to start. Priority is excellent entertainment for children, so a good kids club is a must. Nice pleasant spacious accommodation also, walkable distance to beach and shops and perhaps a village a nice to have. Some evening entertainment. Would also consider Vendee but really need some specific recommendations please. Thank you!!

Vendee has a good reputation for camping, lots of it there so lots of competition.
Have a look at Saint Jean de Monts, it's got a lovely big sea front, a great big pedestrian shopping street, huge food & stuff market.
that's for july and august, at other times it's off season and some shops are closed etc.
I've been there many times as a kid and as a teenager and loved it.