No caravan site is supposed to be noisy at night usually around 10;30 / 11;00pm there is a curfew

Depending on the sites security how energetically this is enforced

if Haven et.al use the site then you can expect a fairly good security

Unfortunately can't help on these particular sites as we've not been

HI cod,
We stayed Le Bois Masson for a week last June before we headed down to La Carabasse, another Siblu/Haven site in Vias Plage.
We have stayed here 3 times before but never in the school holidays so cant really comment on the noise at night except to say that it was quiet when we were there. Decent size swimming pool on site but I would imagine it gets pretty crowded during school hols. Nice area with good beaches nearby. We have been going with Haven/Siblu for a number of years and always found security on their own sites to be pretty good.
Le Bois Masson is just over the road and is very much quieter, with possibly a larger swimming pool.
Hope you have a good holiday.
Degs.