This weekend I did a pre ride of the Big Ring Challenge race course a Double Lake - Cold Springs TX. The trail was counter clockwise, I normally ride it the other way. This made the ride fun and new. I do like the route going this way. 12 miles - it felt longer. Nothing really challenging, just very fast single-track.
There is three long double-track sections. First one is mostly down hill, pass if you can. The second double-track section is long a has a uphill. Get out of the saddle and charge to the top.  Now you get into a very fast slalom section through the tall pine trees, enjoy. The third, is the shortest, it starts out uphill then levels out. Back into the single-track.
My lap times were just under an hour. Not race pace, but quick. If you want to finish top 10, you have to charge off the start.

http://app.strava.com/activities/44638761