They did during the day, they weren't at kids clubs all the time but children do like those, they have a lot of fun there.
The parents spent a lot of time with their children at home, Kate was only part time as a locum, their lives were like that most people who have kids, everything revolves around their timings.
Holidays are for adults and children.
I must say I always took mine out to dinner with us at night but I know it is quite English to have bedtimes for young kids and separate adult time.
Butlin's used to have a baby monitoring service, ie people would walk round the chalets in the evening and if they heard a child crying, an announcement would be made in the dining hall or ballroom so the parents would go and see to the child. That seems absolutely dreadful now but was much the same as the McCanns and friends were doing, half hourly monitoring.