+1 for caching. My little un really enjoys it and as others have said its a great way of finding spots that you wouldn't normally visit.
I nearly wiped out some elderly cachers at the weekend, the daft beggars had parked in the middle of the road on a blind bend with double yellow and double white lines. The cache they were doing was only 50yards from a car park.
I always like to plot the caches onto an os map the night before. I also carry a stick and a laplander as some of the less visited caches get really overgrown. The stick is also handy for fending off curious bullocks.
Until you've gone beyond the parameters, you don't know where they are