If any member of the family needs an incentive to go on a walk then geocaching – the modern version of the treasure hunt – is the answer. Using the internet to get co-ordinates of a hidden cache and using a Global Positioning System (GPS), a small device that looks a bit like a mobile phone and will tell you where you are on the planet to within about 20 metres, you go searching for “treasure” – usually a small toy.

As family activities go, this is one of the best. You need to work as a team to find the right location and then separately to find the treasure once you are there. The cache, usually a small plastic or metal box, may be hidden up a tree, behind a wall or in any other hidey-hole.

When you find one you are allowed to take something out of the cache as a gift for finding it, providing you put something in yourself for the next person to find. Parents are advised to carry a few small treats just in case there is nothing there, and some extras to leave behind for the next person. You can also usually leave a message in a guest book.

Once you’re used to finding caches, it‘s fun to make your own. Anyone can make a cache and leave it in an urban or rural setting. You just have to log the co-ordinates of the hiding place on one of the geocaching websites. Of course, the real joy of geocaching, for adults at least, is the trail you follow and the new sights you see, so if you are making your own cache try to leave it somewhere interesting (and safe).

The cheapest GPS on the market is around £100 but once you have bought one you can use it for as many treasure hunts as you want both at home and abroad. The more expensive models have extras including electronic compasses, maps and voice navigation.

The Geocaching Association of Great Britain (www.gagb.org.uk) promotes the activity in the UK. Websites where you can get started and pick up hints on finding your treasure are www.geocacheuk.com and www.geocaching.com.

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