I can't help.
Explanation:
You need to imagine yourself and decide this for yourself. You would describe it as what you think you would experience. It's a project that has no set answer. It tells you to imagine details that would be along the silk road, and you need to add at least 3 details per sense. I think for smell I would try to describe spices and animals you might find, and you could describe landscapes, people, and animals you might see, and the sound of wind and animals and people and stuff like that, if that helps.