High Altitude Precautions
With increasing altitude, the amount of oxygen available in the air decreases and your body may need some time to adjust if you have come from a lower elevation. 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 is not recommended because respiration during sleep deepens, which can exacerbate altitude sickness symptoms. 

Adequate Clothing
Bring clothing that you can layer so you can comfortably adjust to temperature changes.  Ideally, your first layer should 'wick' - keeping moisture away from your skin and ensuring your core stays warm.   Your external layer should provide wind and moisture protection.

Sun Protection
At 10,000 feet (3,048 m), exposure to the sun is 40% greater than it is at sea level. Sunscreen (at least SPF 15) is recommended for all exposed skin, particularly the face, lips and neck. Be certain to protect your eyes with goggles or sunglasses.