USE SUNSCREEN
No sunscreen protects you completely – but it does help. The Skin Cancer Foundation recommends using a broad spectrum (UVA/UVB) sunscreen with an SPF of 15 or higher every day. If you’ll be outdoors for a longer period of time, try using a water-resistant, broad spectrum (UVA/UVB) sunscreen with an SPF of 30 or higher. The American Cancer Association suggests applying about an ounce (think: a shot glass or palmful) to cover the arms, legs, neck, and face of the average adult and administering it about 30 minutes before sun exposure to help it bind to your skin. Be sure to reapply every two hours or so to help keep you protected and pay special attention to those areas of skin which may not be fully protected by clothing.
Remember: Sunscreen before your suit
If you want extra protection from the sun, the Skin Cancer Foundation suggests applying your sunscreen before you put on your bathing suit.
Why? Two reasons:
You are adding extra protection to the skin underneath your suit.
You are less likely to miss a spot, which can lead to burning around the edges of your suit.