I haven't done that much geocaching yet becuase I don't have a GPS yet (please Santa!), but I've done alot of letterboxing which is the same idea. I take my 5 yr old and my 3 month old. Of course we don't go alone after dark, we don't go places that look "iffy" and we don't go through woods and tall grass in summer, but if your 13 yr old goes with someone else and is careful, it's alot of fun. I guess the biggest think is to be aware of your surroundings. and use common sense. We spent all day Saturday letterboxing in the mountains and it was a very fun day for me, my husband and our 5 yr old. We spent the whole day together as a family and we were outside. No TV or video games. Lots of sunshine and excercise! Can't wait to get a GPS so I can find more!
dawn