Newbies will be thankful for the road crossings, it will give you a way out if needed. The other reviews posted are fitting for this trail, but to add one thing. Go to the West end of I-70 Business Loop, North into park, as far north as you can drive and then ride north till you cross the trail. Not for newbies. Off camber, twisty rock climbs, unexpected trees, and lots of cardio hills.
Sled hill offers extra bonus for speeders.
Very good also because it is only ten miles from downtown. If you are going to be in town for business bring your bike, this trail will give you a quick hard challange five minutes from your hotel. If you are tired, take the fireroad back to the top at about halfway point. This is a fun little piece of singletrack. Reminds me of the Chubb-Tyson trail in St. Louis.