Looks great! I will be in Ferdinand in two weeks (visiting the parents) so I may head over one day for the first time...it appears on the map now that you can do one big loop? If so what would the mileage be and would one direction be preferable over the other?
You are correct, there is now one big loop, but there are also a number of options available to create a longer ride.
The "big loop" is about ten miles, but would miss much of Rocky Ridge and the upper part of Potato Run. Really, to get the whole experience, it involves riding some parts of the trails twice, or riding both directions. For instance, Breeden Ridge and Potato Run almost need to be ridden both directions, since they are so much fun.
For me, I like the flow riding counter-clockwise down Fire Tower and finishing with a climb up the Group Camp Trail. The descent from the ridge-top pond on Breeden Ridge to Potato Run is a roller-coaster of fun.