Tip No. 1: Know the secrets to feeling 💯 in your swimsuit.
Look No. 1: Wear the Rainbow
Bright bikinis are unicorn-approved.
Look No. 2: Dress Like a Tropical Drink
If you didn't sip something out of a pineapple, was it really a long weekend?
Kelly Suit by Onia, $195, neimanmarcus.com.
Look No. 3: Double-Up on the Romance
A wholesome, retro cut is a perfect match for the most magical sea creature.
Look No. 4: Wear Your Emotions on Your One-Piece
Private Party, $99 each, bando.com and urbanoutfitters.com.
Tip No. 2: Get covered—head-to-toe—with the best UV-blocking SPF.
Capsule Sun Gel by Make P:rem, $32, glowrecipe.com: Feels light on skin and won't leave white streaks on your suit.
Unscented Natural Mineral Sunscreen for Body SPF 30, $24, suntegrityskincare.com: A natural, unscented formula is the answer for sensitive skin.
Hairdresser's Invisible Oil Heat/UV Protective Primer, $28, bumbleandbumble.com: Don't forget: Your strands need protection, too!
Tip No. 3: Switch to waterproof makeup that will actually stay put.
They're Real Lengthening Mascara, $24, benefitcosmetics.com: Maybe the most important waterproof product—and this one's the best there is.
Velvet Matte, $7, palladiobeauty.com: True story: we've brushed our teeth while wearing this and it didn't budge.
Mist & Fix Setting Spray by Make Up For Ever, $14, sephora.com: The final spritz to keep everything in place.
Tip No. 4: Wrap yourself in a towel that's a bona fide work of art.
Barbara Kruger Towel, $95, artproductionfund.com: Dry me. That, too, please.
IGWT Sunrise Towel, $80, ingodwetrustnyc.com: Double-sided to better match your suit.
Amaroo Towel, $110, thebeachpeopleco.com: Once you go round, you'll never go...back to a rectangular shape.
Tip No. 5: The only word you need to know about coverups this summer: Mesh.
Satin and Mesh T-Shirt by Ivy Park, $58, topshop.com: Flatform sandals are a must.
Cobalt Mesh Mix by Stella McCartney, $245, farfetch.com: Plain bathing suit? Go with something fun up top.
Embroidered Mesh Dress, $26, zara.com: A flower-shaped tan is a risk worth taking.
Tip No. 6: Shield your eyes with shades that make a bold statement.
The Wild Gift, $72, crapeyewear.com: For when you just dropped that 🔥 pool party playlist.
Dakota, $110, poppylissiman.com: Baby, you're a star.
Metal Twist Sunglasses, $350, marcjacobs.com: These are very Lizzie McGuire, aren't they?
Tip No. 7: Use waterproof tech that will double your fun.
Beoplay P2, $169, beoplay.com: Sounds great, moves easily, and doesn't mind a little water.
Nüüd for iPhone 6s Case, $100, lifeproof.com: Your phone looks so lonely on the pool chair without you!
Underwater Disposable Camera, $18, urbanoutfitters.com: Underwater shots are social-media gold.