talk
English, although you may find all manner of languages spoken at the ski resorts. Interpretive materials in several other languages are available at Rocky Mountain National Park.
health
There's no reason to fear the mountains, as long as you approach them with proper respect and preparation. As with anywhere else, recklessness and a lack of forethought can get you into trouble, especially in Colorado's vast back country.
Altitude sickness
Can lead to dizziness, headaches, nausea, even blackouts and pulmonary edema. Give your body a few days to adjust to the high altitudes before going full throttle with your hiking or skiing.Dehydration
When you engage in strenuous outdoor activities, be sure to replenish your fluids as you go. You may be losing moisture through your mouth and nose and through sweating, but be completely unawares due to the arid mountain air. May result in dizziness, intense thirst and elevated heart and breath rates.Giardia
Drinking untreated water from regional streams is not a good idea owing to Giardia parasites, but tap water is not a problem.Hypothermia
Prolonged exposure to the cold can result in confusion, a slowed heart rate, lethargy, even death. Dress warmly in non cotton clothing to allow any sweat to wick away from your body and evaporate. Otherwise, it may thoroughly chill you later in the day when temperatures drop.Frostbite
During periods of severe cold, your circulatory system pulls all your warming blood into the core of your body to protect your vital organs. This makes your extremities such as your ears, fingers and nose especially vulnerable. Wear a face mask, insulated gloves and other heavy gear on the worst winter days. It gets cold sitting still on those ski lifts!Sunburn
Lather up with sunscreen, even if there's cloud cover. Colorado's high elevation means you have less protection to the sun's powerful ultra violet rays. This can be compounded while skiing or snowboarding, when the rays are reflected off the snow and hits the underside of your jaw. Don't forget to wear UV-rated goggles or sunglasses, as well. There's nothing more painful than sunburned eyeballs.