I have been to most of the Dutch ones when they were cheaper at UK Bank Holidays. The fire in Suffolk changed that as lots of English people changed to the continent and discovered what better value they were.
Best IMHO in order
Het Heijderbos - for the Jungle Dome. The furthest from the UK and full of Germans as you can almost see the border from the site. One explained to me that if they get sick they can just pop back in to Germany for health care. We combined this with a couple of days in Delft then took the incredibly uncomfortable high speed ferry back to Harwich. It is also not far from the Warner Brothers theme park
http://www.moviepark...3/Default.aspx. There is also horse riding on site with lovely little ponys. Most CP this is off site.
De Kempervennen - For the Montana ski centre. This is where my family caught the skiing bug, which is why we don't go to CPs any more.
De Vossemeren - nothing special
Het Meerdal - Where I learnt that scuba diving wasn't fo me.
Erperheide - For younger kids, under 10
Park De Haan - Wasn't a CP when we went but very easy to find and only a very good pool area and long slides. The villas weren't up to CP standard, but this was well over 10 years ago.
I think those are all the ones I have been to, but obviously they have changed a bit over the years. I have never been to any of the French ones as they didn't appear to have the facilities the Dutch and Belgium ones did.