When I find time to go caching, I will usually get the GPS and PDA loaded up, print a map or two, then distract the kids from their TV/Gameboy/Legos/Polly Pocket, etc long enough to see if they would like to go along. About a fourth of the time, my daughter (8 yrs) will go, and about half the time, my son goes (11 yrs). They both enjoy finding the cache, they just don't always go for the bushwacking, or the long walks. The wife has yet to go with us, she always has 'too much to do, and no time". I use it as an opportunity to get out with the kids, talk with them, and teach them about the outdoors and the world around them. They both like to use the GPS and find the cache, and my son likes to use the PDA, so I just follow behind and keep them safe. Of course, everytime we go out camping, or out with the Boy Scouts, my son and I plan to cache where we camp, or along the way, so by nature he gets more involved than my daughter does.
Man! Makes me want to go snag them out of school and go caching now!