Every now and then, I take some pictures of my ride. Often it's when I'm about to reach a large round number on my odometer. (Shut up, 2000 km is large. Anyways, I'm going to follow Tanya's lead, and use large numbers that are powers of 2, which will let me take another pic at 4096 km, instead of having to wait for 5000. But that's not why I'm doing it. I'm doing it because I, too, am a huge geek.)
As I mentioned in the comments on another of Tanya's posts I've been running into a lot of tiny bugs recently, and have started to bike with my mouth firmly shut on some portions of my ride, lest I fill up on bugs before eating dinner.