I really don't like Centre Parcs. Most of the children at my sons school would have a week there so we went along 3 or 4 times. So overpriced, poor food, like going on holiday at a sports centre. They wring every penny they can out of you and if you don't book activities early (which you have to pay a lot more for) you won't get on them.
But the boys loved it and had a great time so it was kind of worth it. I can't see any appeal in it for adults.