Mostly single track with some hikers. Some rolling hills but mostly fairly difficult ascents and descents.
How to get there:
From Boulder, go up Flagstaff Mountain (if you do not know where that is or how to get there, ask the locals...they are sure to help). Once you are at the top, keep going...it is about 5 miles once you are at the top of Flagstaff Mountain. You will know you are at the top when you start seeing houses since the entire East side of the mountain is basically a park. Go about 5 miles west...Walker Ranch is labelled with a sign...but it is on the left side of the road.