Less of a single-track, backwoods trip and more of a "ride to the hike" trip, I biked down to the 2nd Annual FL Hike and Hang (link goes to Hammock Forums, where I'm an active member under the same handle) back in March.
My word report (single post so you don't have to search through the whole thread) is here.
Some photos in posts there (note: large photos, dialup may have issues): here, here, here, here, and here.
Embedded video here.
My set up is pretty simple (and the bike is definitely not lightweight). I ride a Manhattan Flyer 6 with an aftermarket handlebar post to raise the bars up so's I can sit upright. This isn't meant for off-road travel, but it handles dirt roads just fine. I wouldn't want to ride it anywhere with serious hills, but this is Florida; may as well be a pool table.
For my cargo set-up, I've gone through several iterations. Currently, I use a combination of two straps (one to compress the load on my DIY Molly Mac Pack-inspired backpack together and one to link it to the seat post as securely as possible) and my seat post rack to carry my backpack there. Twisted mason's line is also used to lash it down for additional stability.
On my back is the front pack/day pack/bike bag that goes with the backpack, containing my 3L Camelbak, my ditty bag, my wallet and keys, and my poncho (just in case it starts to come on down).
With the exception of my tire pump (strapped to the seat post frame), everything is carried in one of those two spots. Easy-peasy.
She's really comfy right up until about mile sixty or so, then my butt starts to go numb and my quads start yelling at me. As long as I don't intend on going further than that, she's a dream to ride.