We hike and camp a lot with our kids, travel by car a lot . . .
We've started letterboxing. It is soooo fun and everyone gets involved. Does anyone else letterbox?
We purchased stamps for each child initially, although we are going to let our oldest (8) carve a new one this summer.
We've all become better acquainted with our compasses and with reading maps, and it is like a treasure hunt with really fun clues, riddles, etc.
For more info, visit the Letterboxing North America website
http://www.letterboxing.org/ the cool thing is that even if you are visiting or living in another country, letterboxing is worldwide!