Would have: a picnic table and a fireplace with a grille at each pitch.
It would be in a beautiful location with plenty of trees for shade, and lots of wildlife.
Every pitch would be different and individual, with plenty of privacy.
There would be a brilliant, safe play area somewhere in the centre of the site where you could simultaneously see your DC , not hear them shrieking, but they could magically hear you when you called them back.
There would be a secure area to charge phones and freeze freezer packs.
There would be some informal, laid back social events to meet other campers, with no pressure to attend.
It would be within walking distance of a cute village with good shops.
There would be lovely walks straight from the site.
Management would simultaneously be laid back and friendly, but really tough on policing late night noise/ lairy behaviour.
It would be no more than £10 per person per night, and half price for kids.
Actually, I can think of 2 or 3 sites that nearly fit all these criteria...