Looks like someone else has also had the idea to create "Lincoln planks" for the kids to build with. A permanent installation like this could also work well in the right setting, doubling as outdoor seating as well as a balance course
This would be cook for crayfish boil! I think anything with built in cooler space is probably a good idea for summer. Kids wagon, outside seating, or this: DIY Patio Table With Built-In Beer/Wine Coolers.