On every site we have ever stayed on, and on every site that has signs up, we have seen CHILDREN screaming around on bikes, skateboards and these evil mini scooters.
The signs "All children must be supervised at all times" is routinely ignored. The parents of such children are inevitably propping up the bar, and when (as happened on the site we were staying on in July) a 'child' ploughs into somebody's brand new car on site, nobody wants to know, and said so called parents get all arsy with the driver who was actually doing nothing wrong.
Luckily the site had CCTV, and the childs parents were held liable for ignoring the site rules.
But it shouldn't happen. And sometime in the future a child will DIE whilst their parents are p**ing it up in the bar.
So OBEY THE SITE RULES!