The Subway Cave is the most popular feature along the trail and definitely worth doing. There are no signs for the turn, but people have marked it fairly well at about 2 miles in so it's not too hard to find. Beyond the Subway, there were far fewer people and the desert trail turned into a hike through a forest in the mountains. There's a steep hill at the end and the trail concludes at a viewpoint where you're surrounded by cliffs. Forest trails are my favorite and I'm glad I did this hike to the end; but honestly, if I do this trail again we'll probably just go to the cave and back.