I recommend geocaching all the time – it is free, easy, fun, appropriate for all ages, and outdoors! People across the world set up hidden treasure “caches” and then upload the coordinates so that other people can find them. Ten years ago, you had to buy a special unit to read the latitudes and longitudes, but now you can use a simple app on a smartphone! It’s a great way to explore new areas – but there are caches literally everywhere, even in suburbs and cities. You can see more about the local, on-going Polk County Geocaching Challenge we completed last year and there is also a 2017 Wildflower Warren County geocaching challenge!