Also decide you you light a torch or other source of dim or bright light, because even with darkvision you have disadvantage of perception and -5 penalty to passive perception. While bringing any source of light will make any creatures aware of your presence: even if your light radius is 10 or 20 feet creatures from 100 and 200 feet could see the light
You hear seldom cracks and ground vibrating - this is what the other mare runners described you previously usual for this place, you don't hear any voices, screams or whispers that they warned you of.