If I was the principal
If I was the principal I would add a Mcdonalds cafe and the restaurant and you have to bring your own money to school to pay for it. It’s like mosses and juices. If children wanted yummy food they could get it.
My second decision would be that we would have a diving board also a waterslide because children sometimes just hate doing the same dive in the school pool.
My third decision would be that there would be a soft serve ice cream machine. there would be limit of ice cream inside it every day. You can put on hundreds and thousands lollies and flakes.