"If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason." J. Handy
Running the 2012 Boston Marathon for Children's Hospital
Chris - From the description, it sounds like a good entry level trail running experience, since you've already run a road marathon. I found I ran slower (by 2-4 minutes per mile) on trails, but had a TON more fun. Most trails will have rocks, some may have logs to climb over, some will have to go through creeks. Most trees tend to get cleared off the trails regularly. My feeling is it takes more physical "effort" to run the trails, but I don't have a "mental" challenge. I was just thinking yeasterday that of the past 2 50ks I've done, and I didn't have that "Why do I do this?" quitting feeling like i've had on every road marathon. The trails are pretty, and it's a different experience completely.
If you want to do it, get out training on some single track forested trails to see how it feels. Hal Higdon has a good Back-to-Back 8 week Marathon training plan that I have used several times. The secret will be to run as many as your runs on trails as you possibly can.
Your toughness is made up of equal parts persistence and experience. You don't so much outrun your opponents as outlast and outsmart them, and the toughest opponent of all is the one inside your head." - Joe Henderson