Download the Geocaching app on your phone, grab some friends and explore your town or city while hunting for treasure. Jump on a bus if you want to explore further afield. You can find out more at https://www.geocaching.com/play.
Here are the rules for geocaching:
1. Find the geocache.
2. Log your name in the log book.
3. If you take something from a geocache replace it with something of equal or greater value.
4. Log your adventure online.