Generously apply a water-resistant sunscreen with a Sun Protection Factor (SPF) of at least 15 that provides broad-spectrum protection from both ultraviolet A (UVA) and ultraviolet B (UVB) rays to all exposed skin. Re-apply every two hours, even on cloudy days, and after    swimming or sweating. Look for the AAD SEAL OF RECOGNITION® on products that meet these criteria.
 
Wear protective clothing, such as a long-sleeved shirt, pants, a wide-brimmed hat and sunglasses, where possible.

Seek shade when appropriate, remembering that the sun's rays are strongest between 10 a.m. and 4 p.m. If your shadow is shorter than you are, seek shade.

Protect children from sun exposure by playing in the shade, using protective clothing and applying sunscreen.

Use extra caution near water, snow and sand as they reflect the damaging rays of the sun, which can increase your chance of sunburn.

Check your birthday suit on your birthday. If you notice anything changing, growing or bleeding on your skin, see a dermatologist. Skin cancer is very treatable when caught early.

[1] American Cancer Society. 2008 Cancer Facts and Figures.
http://www.cancer.org/downloads/STT/2008CAFFfinalsecured.pdf
[2} Robinson, JK. Sun Exposure, Sun Protection and Vitamin D. JAMA 2005; 294: 1541-43.
[3] Hemminki K, Dong C. Subsequent cancers after in situ and invasive squamous cell carcinoma of the skin. Arch Dermatol 2000;136:647-51.