Although this is a loop hike, I strongly suggest beginning with the left or lower side of the loop. This will keep the stream on your right side the entire hike. You'll begin by crossing a small stream on a bridge - to the left of the Tucquan Glen sign.
It's an easy hike with part of it along an old logging road. Follow the blue blazes. You'll pass the remains of an old homestead. The gorge will narrow as you get closer to the halfway point and you'll have some beautiful waterfalls over huge rocks.
At the halfway point you'll reach the railroad tracks. Turn right along the tracks and cross the bridge over Tuquan Creek. After another 100 feet or so the trail will head sharply uphill on the right. The stream will be out of sight for the first third of the return trip but the trail returns to it soon.