Altitude Sickness

Avoid High Altitude Illness
It's usually a minor problem, is almost totally preventable and can be significantly minimized by following these simple guidelines from the Colorado Altitude Research Institute:
Exercise in moderation.
Drink more water than usual. When you combine altitude with physical exertion, you need to drink before you get thirsty.
Eat food high in carbohydrates, such as grains, pasta, fruits and vegetables and avoid salty foods.
Limit alcohol consumption. It's tempting to party the evening you roll into a ski town. However, drinking alcohol and cheating yourself on sleep the night before you ski is a big mistake. Use common sense.
Wear water-resistant, layered clothing that can be removed or added as weather changes (i. e., long underwear, turtleneck, sweater, waterproof jacket and pants, nylon socks, glove liners, waterproof gloves, winter hat, sunglasses and goggles).
Be sun savvy. Although Colorado tops the list of sunshine states, our sunshine is so intense that skiing without sunscreen or protective eyewear is not recommended. Ultraviolet rays are more powerful at higher elevations. Since resorts are over two miles above sea level, you will need goggles and/or sunglasses that have UV protection. Also, regardless of your skin color or complexion, everyone needs to wear sunscreen, even on overcast days when ultraviolet rays still penetrate cloud cover. Go for at least 15 SPF and apply several times a day. Look for broad-spectrum sunscreen that blocks both UVA and UVB rays.