1. AVOID MID-DAY SUN. The sun's UVB rays are most intense between the hours of 10am to 3pm. However, the UVA rays that contribute to premature skin aging are present all day.
2. BE CAREFUL AT HIGHER & LOWER ALTITUDES. Solar radiation increases 4 to 5% with every 1000 feet above sea level.
3. COVER UP. Although clothing does not completely protect from the sun's rays, a sun hat, long
sleeves, and long pants can help.
4. BE AWARE OF REFLECTED LIGHT. Many surfaces -- sand, cement, water, and snow -- can reflect harmful radiation. Be careful on cloudy days when up to 80% of the sun's radiation reaches the ground.
5. DON'T MIX SUN AND CERTAIN MEDICATIONS.
6. BE SURE TO USE A SUNBLOCK AND REMEMBER TO REAPPLY IT. Reapply it if you towel dry or if you have been in the water. Remember, a sunblock will only provide protection for the length of time indicated by the sun protection factor number.
7. EXAMINE YOUR SKIN REGULARLY. Be on the lookout for any new raised growths, itchy patches, non-healing sores, or changes in moles or new colored areas that might signify a form of cancer.
8. KEEP HYDRATED. Make sure you drink water, non-alcoholic and non-caffeinated beverages while on the beach or slopes. Alcohol dehydrates your body, which is the main contributor to hangovers!
Extracted from http://www.scu.edu/wellness/springbreak.cfm