Click Here to Buy It Now At Walgreens, $7.86
Don't burn while out enjoying yourself. Make sure you pick up a sunscreen that is sweatproof and waterproof, so you can do everything under the sun (literally) without worrying about turning into a lobster.
Also, keep an eye out for a sunscreen that protects from both UVB and UVA rays. These might also be named under "broad-spectrum protection." This Coppertone Sport is an option that hits all the marks, and works as a spray so you can apply it solo (in the event that a beautiful girl isn't around to help you).