Growing up in Omaha, (a town NOT located on the world's largest lake) we had the Peony Park pool. It was built to resemble a lake, with sand on top of the cement bottom, a beach all the way around, docks, fountains, slides and diving platforms out in the middle. It was inside an amusement park, so there was also a monorail that ran around it. A genuine bona-fide electrified monorail.