A flowy maxi dress is a tried-and-true beach necessity — you can dress it up with sandals for dinner or throw it over your swimsuit during the day. You'll be the envy of your Insta followers with a seaside snap in the Banana Republic Poplin Backless Maxi Dress ($149) in hot pink. We also recommend packing a classic little white swimsuit, like the crochet-style Triangl Vinca Syrup Bikini ($99). A relaxed-fit sweatshirt, like the incredibly soft Wildfox Wanderlust Baggy Beach Jumper ($88), will keep you cozy when the ocean breeze kicks in at night. Lastly, invest in a pair of rubber-like waterproof sandals. The Freedom Moses Unicorn Slides ($50) feature a pretty pastel tie-dye design.