To previous poster who asked about letterboxing/geocaching...it's like a treasure hunt. Geocaching needs a GPS, but letterboxing needs nothing high-tech...just clues from the website.
With letterboxing, you make a little 'box' (we use a rubbermaid container) with a small notebook, a pen, an ink pad, and a rubber stamp of your choice. Then you hunt down a 'letterbox'...a box hidden with the same items.
Once you find the letterbox, you use the stamp in the letterbox to stamp a page in your notebook and write the date, location, etc. Then you use your stamp to stamp a page in their notebook and write a little note...who you are, the date, etc. Then you leave their box hidden where you found it for the next person.
I think the website is letterboxing.org or letterbox.org, but I'm not sure right now. You should be able to google it. You just type in your location and they'll give you directions and clues to find letterboxes near you.
I was amazed at how many letterboxes were hidden within 30 miles of us. We are very rural
We only just started (we've found two) before the winter weather hit. We are looking forward to it this summer. A very fun way to spend family time together. Very inexpensive too, if you stick to local ones. We plan to look up letterboxes near where we vacation this summer, so we can find some 'out of town' ones too.