Beautiful singletrack that gently rolls through some of BSF's back country starts out with nice, relatively easy trail and stays that way. Gentle grades make this a great beginner trail. It is harder to find the trailhead than to navigate the trail itself. Once you're on the trail, one turn choice is all there is.
Just past 5 miles in there is a fork. You can take the right fork to a great overlook or make the trail shorter by turning left and skipping the overlook. If you go out to the overlook, you may want to ride only to the first set of steps and hike the rest of the way. It's only a couple hundred yards.
Watch out for the bridges. They were designed for hiking and it's recommended you walk them. The bridges are particularly slick with any moisture on them. Other than the slick bridges, this entire area drains well. Big South Fork is a great area as a fallback when other area trails are too wet to ride.