I did once for a season of trouting (complete with diagrams of multi fly rigs that I used) and for two solid years of waterfowling (complete with diagrams of decoy placement). Since then, I have sadly fallen out of the habit. So thanks for brining this up so I can get motivated to take it back up again!
"They say you forget your troubles on a trout stream, but that's not quite it. What happens is that you begin to see where your troubles fit into the grand scheme of things, and suddenly they're just not such a big deal anymore." - John Gierach