Kid's party games: The doughnut chomp. This also works for apples instead of the typical bobbing for apples (which I think is gross). New set of apples/doughnuts for each group and the kid can have their doughnut/apple when done.
Latch Door - The door opens when all locks and latches are undone. Would be fun somewhere outside as an entrance to a play area - just be sure there is a second way out in case a sibling locks it while you're inside lol
Just a thought for the awesome playground you're making for our school! How to Make an Outdoor Chalkboard- What a fun outdoor activity for the kids! Full tutorial includes list of weather proof materials!