Wait. That's Fight Club.

Still, you're not supposed to let anyone see that you're letterboxing. After all, if they saw what you were doing they might... uh... Jump you and take your stamps. Yeah, our stamps are so valuable the average hiker can't control themselves.

So we slink down the trails and pretend to tie our shoes for way too long. Henry is excellent at this.

We painstakingly count out each M&M to be sure each kid gets not only the same number, but the same distribution of colors. Lilly is queen of treat equality, unless she be the most equal.

And when we're caught red-handed (well, more purple-handed since we don't have a red stamp pad) we try to do our stamping very quickly and rehide the letterbox doubly well. That's where Clara and Amy are really good.

We used all these techniques at Evans Creek Preserve in Sammamish on a sunny, but brisk day. It's been a couple of years since we'd been there and back in 2012 the park was brand new and the trails weren't quite done.

This time we were able to find 12 of the 13 letterboxes hidden in the three miles of trails. And once again, nobody but me and Treen realized we were hiking. (And we were both tired from Mailbox earlier in the day.)

If you haven't tried letterboxing yet, give it a shot. It's a great family activity. But if anyone asks, you didn't read about it here.