Something to do when you stop for a break while travelling, a wherigo, it won't take very long, less than a half hour.
If you need the app for your smartphone , here they are android, iphone.
To play this wherigo you must download the cartridge here .
To learn more about wherigos you can go to Wherigo.com or Geocaching forum.
The container is a micro, there will be a detailed hint at the last stage of the wherigo, have fun.