We went to Elveden last year (first time to Centerparcs) and loved it. We had 5 and 9yr olds. The Woodland Lodge was lovely, we cycled and they loved the pool. We did the basic activities (tennis, boules, football, magician, canoeing) - none of the aerial adventure type things, and they loved the pool (especially the rapids). We are lucky that we get 2 weeks at May half term so we can go outside of what Centerparcs class as half term (so its quite reasonable - well as reasonable as Centerparcs can be) and its not massively busy.
The cost of a Woodland Lodge is pretty much the same at all of the Center Parc villages for our week. So the question is - which one would you go to? Elevden is a trek for us (we are in the NW) but I would readily do it again because we liked it - DH thinks we should try Woburn or Sherwood Forest.
All up for consideration - I suppose priorities are accommodation / pool / cycling and generally nice village. Which would you go for?