First of all, this trail is pretty much uphill all the way to the top, with a few flat portions. The middle and most of the trail beyond is real rocky and full of pine roots. For an uphill on a Mtn Bike, pretty rugged; be prepared to walk part of it up. At the top I suggest taking a right (I believe this is Spruce Rd) and heading back toward Breckenridge mountain. You can take several trail options that will funnel you down toward Beaver Run. Overall a fun trail. I think better for hiking though.
This is a nice hike and ranges from easy to moderate level of difficulty. While the hike is pretty and you can see mountains through the trees, the view is mostly blocked so there isn't much of a reward for completing the trail. You do, however, have the option to continue on another trail which may yield better scenic views.
I live off this trail and use it regularly to go in and out of town. It runs along a shallow but fast creek and there are a couple of bridges. You can make it as long or short as you would like as there are multiple choices for loops. If you have the stamina it will take you all the way to Mohawk Lakes. Beautiful scenery the whole way. Easy to moderate levels as it has a steady incline.
I took this trail all the way to the base of the Mohawk Lakes, but by then was too tired to make the steep climb up to the Mohawk Lakes so I decided to just enjoy the Mayflower Lake near the base. The hike was all uphill, but gradual enough, and I never saw a single person (other than one hunter who lives in a cabin along the trail) and he told me most people only go a little bit from town, and the rest of the trail has nearly no traffic. That was my experience. Once I got near Mohawk Lakes the trail got crowded with people who had driven in - I loved that I had hiked all the way from downtown Breckenridge and enjoyed a quiet trail. I plan to return and do Mohawk Lakes, but from the trailhead to those hikes to save energy. I hiked from 8am to 2:30pm, and bummed a ride back to town to save the return trip, though hiking down would have been a lot easier than up. (obviously)