With summer in its steamiest period, the most comfortable and fun places to chill out center around water.

For fun combined with beautiful people and relaxed chic, you just can’t beat a happening pool scene. And now’s a great time to take the day off (or plan out a weekend) around some of the region’s coolest resort pools, as well glean as a few ideas about the clothes and accessories to wear there.

What: A slick rooftop spot with city skylines in every direction.

Where: The Colonnade Hotel (www.colonnadehotel.com/roof-top-pool).

Who’s here: Lots of designer-friendly singles, girlfriend groups, and well-heeled tourists.

What to wear: Make a huge splash with Missoni’s stunning Long Cover Up ($1,350 on revolve.com), in the brand’s signature chevron pattern, made electric with multicolor boosting.

What to know: Rent a cabana in advance for the best seat in the house.

What: A stunning, sweeping beachfront setting that feels like the Hamptons, but closer to home.

Where: The Dunes on The Waterfront (www.dunesonthewaterfront.com) in Ogunquit, ME.

Who’s here: Decked-out millennials and posh international visitors.

What to wear: Fit right in with the yellow decor by donning the Saint Tropez Cutout One-Piece ($345 on olivela.com) by Juan de Dios — a ruched and rope-trimmed one piece that casts a sunny spell.

What to know: Order the charcuterie board before jumping on the property’s pontoon boat.

What: A majestic seaside Cape Cod pool that feels like you’re hanging at a friend’s mansion.

Where: The Wequasset (https://wequassett.com), in Harwich.

Who’s here: Families rocking a Ralph Lauren vibe.

What to wear: La Blanca Waverly Bell-Sleeve Cover-Up ($59.99 on garnethill.com) in indigo (a lovely navy blue), an intricately crocheted, sexy-but-tasteful piece that hints at the bikini underneath.

What to know: Get seats by the fire pits, so you can partake in cocktail hour at dusk.

What: Sweeping views of a pristine harbor and quaint lighthouse.

Where: The Viewpoint (www.viewpointhotel.com) in York, ME.

Who’s here: Boho-chic couples, low-key luminaries, and intergenerational cool kids.

What to wear: The Black Royal Halter One Piece ($99 on johnnywas.com), which isn’t black at all, but a joyful and luxe flower-inspired print, with an incredibly flattering cut.

What to know: Lady Gaga’s sister just got married here. Accessorize appropriately.

What: An artsy, party enclave in a historic resort town.

Where: Wayfinder (www.wayfindernewport.com) in Newport, RI.

Who’s here: Tatted-up and fit professionals, all out to enjoy themselves.

What to wear: This is retro territory, so go full caftan with the Palm Printed Austin Caftan Coverup ($258 on neimanmarcus.com) by Ramy Brook.

What to know: Their menu of frozen cocktails and the cucumber vodka sparkling mojito are must-sips.