Hi
Not sure if you have booked for Port Grimaud, but if you have you will have a lovely holiday, it's great for kids, we frist took ours 11 years ago and try and get back each year, even its just for a week, we fly down and hire a car.

No there is not a pool at Prairies de la Mer, but a lovely beach, lots of children swim here.

We stayed at the Marina one year, which is just along the road for Prairies de la Mer and they have a pool and a lovely childrens section,

http://www.holiday-marina.com/en/

Have a lovely holiday, we always do.

Smiles
Cath