We stayed at Center Parcs, Elveden Forest for a 5-day week in June. We had many family holidays here and at Sherwood forest when I was a teenager and I was most looking forward to the swimming dome. I was quite surprised to find it had barely changed since I was last there almost 20 years ago! The main dissapointment was how noisy it was in there, to be expected when it's full of screaming kids but last time I was there I was one of them so it didn't occur to me that it wouldn't be a relaxing place to sit and read a book! Anyhow, the rapids were as good as I remember them, the best bit, and all the slides etc would make it a fab place to keep kids entertained all day.
We had a 2 bedroom villa not far from the main centre so that was handy and meant we didn't need to hire bikes. The villas have been decorated recently and everything was nice and clean and modern with everything we needed.
There is lots to do at Center Parcs, obviously, and plenty of places to eat. We particularly liked the Foresters Inn because it was a bit further away and therefore a bit quieter. The service was also very good everywhere.
I would recommend it more for families as that's more who it is aimed towards, but it still had plenty to offer adults and you could never get bored with everything they have to offer!