I can recommend this site. Been there 3 times in the last 5 years. A fairly straightforward drive from Calais, we always get stuck in traffic at Antwerp though. There is no language barrier at all at the dutch parks and they are much better value than the uk ones. There is also an indoor ski slope and go karting very close by. The park looks a little tired compared to the uk ones but we may well be making a booking this weekend
Center parcs in Europe is so much cheaper to book than in U.K. We booked in Jan this year for May half term week Mon-Fri for Le bois aux daims. Lovely site. We got 2 bed VIP cottage with family discount for £400.