Go geocaching at Polesden Lacey, Surrey

A girl with a handheld GPS at Wicken Fen National Nature Reserve, Cambridgeshire

‘We have a geocaching trail that’s great for first timers and old hands,' says our ranger at Polesden Lacey.

'Please bring your own GPS device and you might want to pick up a map with some clues from our visitor reception, as your GPS device many not pinpoint the exact location of the cache; it’s a hunting game.’