Regarding your plan to turn around if you sense AMS symptoms, please remember that a part of AMS can compromise your judgment, which means that if you experience it like I do, it is a little like a drunk deciding if he is too drunk to drive. I get disoriented, even losing the trail (this is a trail that is very hard to lose). My symptoms of nausea and double vision are easier to recognize, but if you experience impaired judgment, the illness may well prevent you from recognizing your impaired judgment. One possible solution is to talk to people along the way. When I'm just in my head, I don't necessarily recognize my disorientation, but when I talk to people, I can feel and hear a sluggishness in my thoughts and speech, primarily because I'm not keeping up with someone else's mental pace. My brain adjusts to my mental pace (meaning if I'm just in my own head, slow becomes the new normal), but when speaking with others, I can feel the difference between theirs and mine.
Please note that I don't drink, so my comparison to someone who is inebriated may be way off base.
