Well that depends, type of lake, constant level, drys up, changing areas, grass park lot, dirt?or where they lay and catch rays, near consession stands.
one of the best is a roped off swimming area, where swimmers grab the rope and rings fall off, or float rental area, near launch zones, where they play with their rental, docks at dry time. Vista points where the would make a wish. Just a few to mention, good luck!