Privacy concerns prohibit me from explaining why we went to Center Parcs this weekend, but that was where we were. Center Parcs, in case you've somehow managed to miss the commercials for it, is a sort of vacation park, where everything is available in one neat and tidy little package: you rent a little cabin and are free to take advantage of many of the amenities on the campus. The place where we stayed featured a "tropical swim paradise", a climbing gym, a marina where you can rent boats, and of course, a bike rental place. I'm not sure if you have to pay for things separately; tickets to the water park (Aqua Mundo) were included in the price of our cabin, but I believe you have to pay for the other amenities separately.
As for the Aqua Mundo, the only attraction we had tickets for (i.e., the only attraction that was of any interest to our nieces) and hence the only one I availed myself of--having a 16-month-old kidlet in tow doesn't make for easy climbing or safe sailing, anyway--it was nice, and quite surprising how many water slides can be crammed into one building. The chlorine was present but not overwhelming, with lots of plants and rocks hiding the entrances to the slides, making it seem a lot smaller but much prettier. You might think that, with a wavepool full of babies in "flotation devices" that the water might be foul, but it wasn't any dirtier than any other public pool--certainly there was no poop in it, though there were relatively large quantities of sand carried in by kids and their parents from the sandboxes. But by far the most surprising thing was the fact that there zero attendings standing at the tops of the slides, okaying you to push off. There was only a light--red (stay put) or yellow (proceed with caution)--and yet everybody, from the most rambunctious kid to the curious old guy, had the patience to wait their turn and not get ahead of themselves. My only quibble with the entire place is that the changing room--like all Dutch swimming areas, there is no men/women divide, but lots of little private changing rooms--is a pain in the ass to get into and out of if there are a lot of people, because you have to go through a changing room in order to traverse between the walkway to the water park and the walkway to the entrance/exit. I lost kidlet's shoe in there the second day; finding it took less than a minute, but it was 10 minutes before a changing room freed up so I could get back out.