last year i ran from lincoln woods to zealand road using shoal pond trail. everything was runnable except shoal pond trail which had a lot of bog bridges. You have to be real careful to make sure you follow the wilderness trail all the way to shoal pond trail, a few false trails near the end. if you are doing the reverse perhaps thats not a problem. i did not take thoreau falls trail, i heard it was easy to get lost on that trail due to not well marked. it was a nice run, i think i did 4:14 or 4:34 or something like that.