Le Chatelet Holiday Park

Great Park. Not too big. Access to two beaches although along a path with a steepish drop at one side at some points, so definitely need to hold toddlers hands.
However on the last day we did spot another way of accessing the beach cutting off the path and you can of course walk via the road as well.
The campsite is exactly what we were looking for. It has a rectangular pool and toddler pool but no slides etc.
There is a shop on site which stocks a good range of essentials and fresh baguettes in the morning.
A nice bar which I think does entertainment but the World Cup was on while we were there on a big screen although on our last night we did sit in on a great multi-lingual Karaoke night which everyone enjoyed.
Campsite staff very friendly. There is a nice little restaurant very near the campsite and when we went at the start of June it was easy to get a seat there at 6 in the evening.
There were also markets in St Cast two days a week - Tues and Friday I think and the Tuesday ones are just along from the campsite.
It is about a half hours drive from St Malo.
Only quibble is there weren’t enough table tennis tables for the number of kids, even at the start of July.