I found this weirdly interesting. There's some good photos/information on those websites. These sites were probably way ahead of their time. I suppose the philosophy has never changed, just look at the likes of Center Parcs!
Had to stop watching after 3 mins, went there 1966 - I was 8 - hated every minute , The big clowns face on the wall near the freezing cold outdoor pool, the word Kent makes me shudder to this day....