This weekend's Tucson Festival of Books is looking bigger and better than ever, but attendees will be at a high risk for too much sun exposure without the right precautions.

Ultraviolet rays from the sun are the number one cause of skin cancer, researchers at the University of Arizona Cancer Center say.

One in five Americans will develop skin cancer in their lifetime and if not caught early enough the results can be disfiguring or even fatal.

For those who forget to lather on the sunscreen, the UA Cancer Center's Skin Cancer Institute will have four sunscreen stations throughout the UA mall during this weekend's festival.

The sunscreen stations include signs explaining the proper application of skinscreen, a mirror to help apply the sunscreen evenly and a gallon of SPF 30 sunscreen.

There will also be free sunscreen and skin cancer information available at the UA Cancer Center booth #515 in Science City at the festival.

 Spring brings warmer and longer days and more intense sunlight.

 The UA Skin Cancer Institute has these tips for attending this weekend's festival:

 ∫Dress in long-sleeved shirts and long pants. Darker colors and tighter weaves work best.

 ∫Wear a wide-brimmed hat that covers your head, face, ears and neck.

 ∫Protect your eyes with sunglasses that have large frames and 99-100 percent UVA/UVB protection.

 For more information visit