Siblu runs children's clubs on the site. The youngest age-group, which I think is 4 and under, is a playroom where you have to stay with your child. You have to book it, and it does get filled up. The sessions are 2 hours in the morning and 2 hours late afternoon. We tried it once and decided that it was just as easy to keep DD with us.
The next club up is the Tiger Club. The kids do a variety of crafts and games and learn to sing an extremely irritating song, which is reproduced at every opportunity at the evening entertainment. The hours are the same as the baby club hours.
There is evening entertainment on the terrace, following a variety of themes. It starts out very child focussed, and becomes more adult as the evening progresses. It's all a bit naff, but the kids love it. When we were there in August, it was extremely busy and drinks were expensive. All the entertainment is fully bilingual.
Older kids who don't want to do the entertainment can often be found on the sports arena playing football, or just hanging out. 6 is on the young side for this.
The pool area is fantastic. There is a warm indoor pool, tube slides, an indoor toddler pool with gentle beach area, so suitable for anyone who can at least sit up. The outdoor pool is divided into several areas, including a water polo area, and an area with various water cannons (similar to the one at Legoland).
There are various nice playgrounds dotted around the site.
There is a laundry facility with lots of washers and driers. It is fairly expensive (but needs must), but you can save money by taking your own tablets. If you plan to use this, take something to carry your laundry in - we used IKEA bags.
We used the Leclerc in Concarneau (about 15 minute drive) for our food, and occasionally the Intermarche in the nearby village. Leclerc is also a good place to buy holiday gear (buckets and spades, boogie boards, etc., and they have an internet terminal. We ate once at the onsite restaurant - not brilliant, but OK. We tend to eat lunch out on these kinds of holidays and have our dinner in. We went to beaches most days, so ate lunch wherever we were. The lunches are very long by British standards - a good hour and a half. Prices for food are reasonable but expensive for soft drinks. We soon learnt to just get a jug of water (un pichet d'eau) for the kids, or squash (sirop). Buckwheat pancakes (galettes) are the specialty of the area, so it is worth having at least once. The local town, Pont Aven, is a mecca for this sort of thing.