The Skin Cancer Foundation recommends the following beach sun safety tips:

Apply plenty of Sun Screen
To ensure that you get the full SPF of a sunscreen, apply 1 ounce (about a shot glass full) 30 minutes before sun exposure to allow the ingredients to fully bind to the skin.

Cover Up
Protect your head, face and eyes with a broad-brimmed hat (at least 3″ all the way around) and sunglasses that filter out 99 to 100 percent of UV radiation. Cover up with long sleeves and pants when you aren’t swimming. For women, brightly colored, long sarongs are another good option.

Seek the shade and plan visit according
The sun is most intense between 10 AM and 4 PM, so why not try an early morning or late afternoon trip? You’ll avoid the crowds (and traffic) and have the beach to yourself. And you’ll get to enjoy the calm of daybreak or a stunning sunset. Early birds might consider heading to the beach by 7 or 8 AM and plan to leave by noon. Late risers might opt to arrive after 3 PM and can stay as long as they like.