Letterboxing. Someone hides a container that has a log book, and a rubber stamp and posts clues on how to find it on a letterboxing website. Another person goes out with a log book and a stamp that represents that person. They follow the clues and find the container. You take the stamp in the containor and stamp your book as proof, momento, whatever that you were there. Then stamp your personal stamp in the containors log book so the owner of the box can see who was there. They have boxes all over the world. I prefer the boxes out in the woods, at least a mile of walking, 2-3 mile ones are nice. I always did like hiking out in the woods and still do but when letterboxing you have a destination or goal. They also have drive up letterboxes, Urban letterboxes. Their everywhere.A lot of the stamps are hand carved and are really a work of art. Some people go to get the images from the stamp, some tpo see how many they can find. some the social aspect and some like me are for the walk.