French Recommendation please!

Hi, Planning our first trip overseas this summer, in desperate need of sunshine, so planning to head to North Atlantic coast/ Loire sort of area. Travelling from Portsmouth to Caen, and arriving at 14:45hrs. Think I've whittled it down to 2 campsites, and wondered if you could help choose one! Choices are: Lac de Saint-Cyr (L09) or Domaine des Forges (A43). Have 3 kids, 6, 7, and 9. Hope someone can help!