I've been on the 400 trail in the winter and have visited some spots on that trail during the summer and it is always cool seeing the differences. I have yet to see the tunnels in the summer but during the winter only one is open (altho it may be different now as this was a few years ago)
As for Lando where you are headed, I have been on every section of those trails both during the winter and during the other seasons and it is always amazing to see the change. Altho I can say this with certainty, I usually cover all the trails a lot faster in the winter than the other season. BTW they are working multi-use trail loop around the Sylvania and get most of the riding off of county roads, the project currently wil run into 2013.
Thanx for posting the pics!!!