Easily my favorite trail in STL. Varied trail surfaces, lots of inclines and declines, and the beauty of these Woods make for a great hike. it takes me about an hour and 15 minutes to get round the entire thing but there are offshoots that allow you to lengthen or shorten as you like. It is primarily a mountain bike trail so be prepared to step off the trail as they come by.
In the summer, it gets hot and muggy back there so bring water. And it gets pretty ticky too, so don't skimp on bug spray.
For an extra bonus, pick up the Lone Wolf trail connector to go up on the bluff overlooking the Meramec River. Great views.
This trail was great. It was well-maintained for the most part. I really liked how the walking surfaces were varied—it made it more interesting (gravel, hard packed earth, wood chips, etc)
There were only a couple parts that I found to be pretty tough, but I'm very new to hiking, and not in the best shape yet. There was a really long steep hill near the beginning that just kept going and going... but I felt fantastic when I reached the summit :-)