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Also have a look at www.landal.com - many sites (all over Holland) have similar facilities to CP and they are MUCH better value. I have Het vennebos on my wishlist for this year. We have stayed at Hoog Vaals a number of times as it is only about an hour from home, and also a couple of the German ones.
I have been to Port Zelande twice and going back in March for a long weekend. Its BRILLIANT! Gorgeous houses around a lovely marina, with beach, dunes, boats, etc. The staff could not be friendlier and the pool is amazing. Haven't done any of the 'extras' so can't comment on prices. From all I have heard about UK parks, I wouldn't bother, but Netherlands parks seem to be a lot classier. Have a look at their website for pics.