A family got a sports retreat on Long Island on this side of the camp.

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Is it yellow? Still green? No matter where you go in the tennis color debate (according to the record, the International Tennis Federation uses "retinal"), sulfur color is a kind of, according to Gislain Venus, "there are only about three people in the world. I absolutely love it." You can count her as one.

"For me, there is nothing more exciting than having a perfect excuse to use this color," said the Dutch-born, New York City interior designer and brave colorist. Her "excus" was that she designed a peculiar tennis hall for a family's summer house, overlooking Montauk Lake at the tip of Long Island.

The pavilion is the latest project completed by Ms. Viñas for Paige West and Christopher Cooper in the past two decades. Ms. West is the founder of the now-closed Chelsea art gallery Mixed Greens. She is the curator of West Collection. She and her father, Alfred Weiss Jr., chairman and CEO of financial services company SEI Te (Alfred West Jr.) collected these collections together. Her husband Mr. Cooper is the founder of FanHero, a technology company that helps celebrities monetize social media content.

The couple have three teenage sons. They collaborated with Ms. Viñas and the construction company Arcologica to tailor a stylish and low-key sanctuary for their Montauk home for guests to play and relax. They even gave this house that can accommodate up to 24 people an interesting hybrid name: Floritauk Motel-this is a mashup created by Ms. Viñas, which combines the two main aesthetic influences of this house, Montauk and Florida. Since she and her family have spent many vacations there, the latter is particularly prominent in Ms. West's childhood memory.

She said that the idea behind Floritauk is to capture the carefree, down-to-earth feeling of family and Montauk, while creating a retro Florida atmosphere with tropical beach tones against a clean white background. "It's all very interesting and witty," the designer said.

After purchasing the adjacent open space a few years ago, Ms. West and Mr. Cooper decided to expand the story by using the land to build a tennis court and pavilion they named-why not? — Floritauk Tennis Club.

Local laws stipulate that in order to install a tennis court on the property, they must also build a structure on it. Therefore, they commissioned Arcologica and Ms. Viñas to create a 1,650-square-foot pavilion: a low white brick building, leaning on a slope, topped by a roof with a bocce court and sedum plants, and the surrounding vegetation Melt into one.

However, this restriction ends on the minimalist glass steel French doors of the pavilion. Inside, Ms. Venus takes a very different approach to the space, which includes a kitchen and bar, a lounge area with a TV and a ping pong table, and a dressing room. "We definitely adopted the whole kitsch retro vibe," said the designer, who enhanced the pattern and bright colors, including, yes, the unique tennis tone.

In fact, Ms. Viñas gave it a protagonist, decorating the lounge's 12-foot-long benches and a pair of rattan-frame cushions with the company's light green S. Harris fabric. Complementary colors abound, from emerald tiled bar counters with brass details and tufted cyan leather stools to sleek Granny Smith green bookcases. Christian Lacroix’s tropical plaid fabric covers two sofa-bed-like sofas with a modern Saarinen table between the sofas.

The Clubby canvas awning features bold black and white stripes and well-proportioned scallop edges, adding a graphic style above the benches and walls, where the Floritauk Tennis Club logo is playfully imprinted. Providing a similar visual impact in the kitchen and bar area is the classic Florence Broadhurst bamboo lattice wallpaper. Ms. Viñas “transformed like a steroid, 20 times bigger than usual,” she said.

"Those bright colors, brass, stripes and bamboo lattice wallpapers-all these are my childhood when I grew up," Ms. West said. "This is a very 70s and 80s color scheme, I remember my grandmother's beach house, we just let the flow go."

For the dressing room, Ms. Viñas chose a crisp golden and white scheme, covering the walls with Bob Collins & Sons' Canary Yellow Bamboo and Birds paper. She custom-made tassels for the lockers, with discrete numbers corresponding to family birthdays and other special dates.

In another winking nod to old-school country club culture, just outside the locker room, Ms. Venus installed a simulated trophy box, with artist Jonas Wood's hand-painted tennis wallpaper as a whimsical background. The glass case was filled with vintage engraved chalices and plates, most of which were bought by Ms. West on eBay, and she only won the runner-up. "There is no winner in this group," she said. "But there are some great mixed couple trophies and third place trophies."

To complete the story of Floritauk, Ms. Viñas’ husband and graphic designer Jaime Viñas created a series of Floritauk brand hats, T-shirts, sports belts and bags, as well as stationery, postcards, trays and cocktail napkins. There is even a bar menu that lists special homemade cocktails such as Floritaukito, Route 27 Sour and Esther Williams named after Esther Williams, Esther Williams S is the hero of Ms. West's grandmother.

"When you get down to the tennis hall, you will feel very happy and be teleported to another world," Ms. Venus said. "It's all very dramatic."

For this active family, this pavilion was a great boon for the summer when it was restricted by the epidemic last year. "This is the first year we have really made the most of it. For three teenage boys, we found that they spend more time in the house than in the house," Ms. West said.

So what's new this summer? Ms. West said that the bocce drink menu is being made. Just as one of the boys requested, the Floritauk bucket hats are being made to give away to more guests they hoped to be more than a year ago.

As a frequent visitor to Floritauk, Ms. Viñas said, "The swag is incredible. It's all part of the fun."