Lizzylou - Ty Nadan? If so, yes. We were only there for a week, with friends in a separate cabin, and would happily have stayed an extra week. Only complaints I have heard about the site are noise problems if you are too close to the central food/shop/bar area, as they have evening discos for the teenagers and so on. We were far enough away for it not to be a problem.
Cost of activities can add up (and you need to plan in advance and book, as some are v popular), so we rationed them out a bit, but a lot of the morning children's club activities are free, and the pools keep them busy a lot of the day. Lots of good places within daytripping distance too (Concarneau, Pont Aven etc).
If you want a day at the beach, can I recommend the little beach at Kerfany les Pins (drive through Quimperle & Moelan-sur-Mer, follow the signs)? Perfect little sandy beach with rockpools around the edge, big carpark, children's playground, cafe/bar, creperie, ice cream shack etc... Much nicer than the beach the campsite suggested.