Photo: Peter Rosa

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19. While you're frolicking on the beach, give your hair a conditioning mask, such as Kérastase Nutritive Masque Magistral. Work a quarter-size dollop through your hair from roots to ends, then pull it back into a bun or a braid.

20. The fastest summer routine of all: Just throw on a pair of colorful, stylish sunglasses—and go.
From top: Diane von Furstenberg, Toms, and SEE.