This is the same, already known, sandbox with a sliding cover. But if you move this cover, it can serve as a countertop. On the resulting table you can play board games. And parents will make sure that these games are developing, useful and bring pleasure to children.
You can make a set of several covers for the sandbox, preparing them accordingly for different games. Children, in addition, can just play on the table, sitting in the sandbox with their toys. And when they play enough and leave, you can slide the lid and get a nice little table, decoration of the playground and the site in general. At the same time, there is a guarantee that animals will not play in the sand while there are no children there.