If your looking for an interesting way to pass the time geo-caching is a great way to do it. What seems to be the biggest newest fad, geo-caching is taking the world by storm. Anyone that has a Navigation system or a GPS can get involved. The old beep and bleep systems are quickly being replaced with high tech systems that are amazing tools.
Depending on what you purchase your capabilities are limited. If you take a low end system for example you may not have all the extras that others will have. If you want to go high tech geo-caching you'll need to do your homework a bit.
So your likely asking what is it, and why the big attraction. Essentially it's bringing out the youth in you. If you ever remember playing capture the flag, or going on treasure hunts you will enjoy geo-caching. Geo-caching is essentially playing hide and seek with items, or people and utilizing GPS and other technology to find your way. It is similar to the ancient game of letter boxing.
You will get to meet all kinds of interesting people if you take up the game, they have devoted websites, forums, and meets for fanatics. The plain and simple rule is once you begin playing and you find your first item, you are suppose to leave an item behind for the next person. They in turn will post that they have found your item etc. These adventures can take you through the wilderness, and into very tricky terrain. For the most part the info provided should let you know if you need to be advanced or low key.
If you have a GPS, or similar navigation system you can get involved. I think once you try it you'll be hooked. I have heard of a story where a very well to do gentleman left a decent sum of money to unknowing searchers.