For a get-out-and-play idea how about GeoCaching. Below is a short video to explain what it is and how to get involved.
Geocaching is a high-tech treasure hunting game played throughout the world by adventure seekers equipped with GPS devices. The basic idea is to locate hidden containers, called geocaches, outdoors and then share your experiences online. Geocaching is enjoyed by people from all age groups, with a strong sense of community and support for the environment. Search for a geocache below or learn more about getting started.