Suggestion: 1. Try not to wear contact lenses (if your eyes are short-sighted), because the climate there is dry, it is not convenient to eat and live during the trip, and cleaning is more troublesome.
Try not to look directly at the sun. It's snowing. Take sunglasses when you go out (if you are nearsighted, you can buy nearsighted sunglasses, the actual price is 400 yuan).
If you want to play, you'd better have a car that can be on call, so that you can stop and have a rest even if you are uncomfortable. Also, you can stay in your favorite place for a while!