My Recon currently set up for fishing:
I keep a small tackle box and other assorted gear in the main compartment:
Attached a Maxpedition small TacTile to the front to hold other assorted tackle. 50 mL Falcon tubes from the laboratory are awesome for storing the Berkley Gulp saltwater bait; the resealable packages they come in always end up leaking all over the place.
Usually my phone, keys, and wallet go in the flat pocket so they don't fall out when I'm rock-hopping.
I don't get a chance to carry a pistol in the bag very often (pretty difficult for us Californians in urban areas to get CCWs), but I use the Recon all the time for fishing, mountain biking, and hiking. It's just so damn useful to have stuff right up front where you can get to it easily. Definitely one of my most favorite pieces of gear. Now to save up for an Umlindi...