How cool would it be if when you walked down the street, a box was floating in thin air? You hit the box and WHAM, a giant coin falls into your hand. This a what fans call a Real Life Game or RLG.
This was a very exciting project. It focuses on Canada, but feel free to use it as a template to guide your kids in anything. You would just have to take out the Canadian parts and replace it with your topic. Maybe the Great Gatsby as a video game in real life or something about the French Revolution.
This includes a guide for the students and a guide for the teacher as well which discusses all of the potential pitfalls (no pun intended) and ideas for real life games my kids came up with.