Student leaders are forgetful. They leave their stuff in the woods, and then can't find it later.
As you walk through this section of trail, count the number of objects you see that don't belong in the woods. Count silently, and do not point out any of the objects to other people in your group.
How many objects did you find? Was the color or texture of the object important? Was the location of the object important?
Some animals blend in well because of the camouflage color they are born with, and some blend in well because of where they hide.
Do you think you would find more objects if you tried again? Do you think you would find more if you worked as a group?
Nobody knows how many objects are out there. The forest sometimes swallows them, only to puke them back up again years later. Don't make it your goal to find ALL the objects. Just try to find as many as you can.
Do a few awareness exercises before attempting the camouflage trail, so your students are in searching mode.
Be sure to discuss object location as a factor, and not just color. Also discuss what predators might be looking for and what prey might be looking for. Would they see different things?
Take your group through the trail more than once, but with different parameters each time. Don't forget to look for staff in the bushes - we might be hiding!