[zelos]

I've only been once and didn't really enjoy it (family with two kids, 6 and 3, at the time). I can see why people do, though.

You could do all the activities (apart from the swimming pool), better, cheaper and in nicer surroundings, in a cottage in Wales or similar, but that would take planning and effort and (as the article points out) probably involves some driving rather than cycling/walking everywhere.