This trail, especially the first part of it (travelling east to west), is one-way in that direction. The second half of the trail can be a little confusing to navigate due to the multiple options. There are signs that will direct you to the "Main Trail," follow this to complete the trail as mapped out.
The Green Trail, called the "Downhill Trail" on the map and on trail signs, is probably more akin to a "flow" trail than a true downhill trail. The first segment follows the power lines that run along Hwy 70 and has a few nice dips and climbs, as well as a couple runs through the woods that are fun to hit with a little speed. The second half, called the "Downhill Extension" has slightly less elevation change throughout but has multiple drop-ins, bridges, pumps and a drop or two to keep things interesting. It terminates at the entrance to the Yellow Trail, before the "Boundary Trail" climb. Total distance 3.6 miles.