High Altitude Precautions
If you live at a lower elevation, take it easy at first. Altitude reduces the amount of oxygen available in the air, and your body may need some time to adjust. Symptoms of altitude sickness include shortness of breath, difficulty sleeping, dizziness and reduced appetite.  Drink plenty of water, avoid excessive tobacco or alcohol consumption, and get plenty of rest.  Sleeping during the day however is not recommended because respiration during sleep deepens, exacerbating altitude sickness symptoms.

Adequate Clothing
Mountain weather changes quickly and the air temperature drops at high elevations when evening falls.  Bring and wear clothing that you can layer so you can comfortably adjust to temperature changes.

Sun Protection
At 10,000 feet (3,048 m), exposure to the sun is 40% greater than it is at sea level. Don't forget to pack and wear sunscreen (at least SPF 15), a hat and sunglasses.