After exploring several trails from the base of Cougar Mountain, I decided to start at the top for a change. (I noticed several ""Proposed Land Use Action"" signs for further subdivision on the way to the park---grrrrrr). I arrived at the park, enjoyed the view, then started down the Shangri La trail. 
The trail was absolutely beautiful. It was cloudy, but relatively warm for December and not raining. The leaves have not yet dissolved so traction was good and mud was not really an issue. My dog and I flew down the trail, then branched off and went to see the Fantastic Erratic glacial boulder. If I found it correctly, then it's covered with baby ferns. I headed back up, going a little slower this time. (I do recommend starting from the bottom, and heading downhill, not the other way around!) 
Overall the trail was great. Several spots on the trail had recently been worked on, so no extraordinary work was necessary. I've noticed that most of Cougar Mountain's trails are very well-maintained. I started on this journey late in the afternoon and didn't have time to go further, but still enjoyed the trip.