It was just a typical Marc Leder party: a 290-foot chartered cruise ship, 100 of his closest friends — including no fewer than three Real Housewives — and enough rosé to fill the ocean, thanks to shipments flown in from Ecuador.

Most people treat their pals to dinner or coffee when they’re feeling generous. Leder, a 53-year-old private-equity titan, treats them to an all-expenses-paid, seven-day cruise to the Galápagos Islands, complete with snorkeling, a massage room and, of course, its own hashtag, #SSLeder.

Now the middle-aged playboy, worth a reported $400 million (though sources say that number has likely doubled), is bringing the party back to the Hamptons after a break last season following some bad press over his wild beachside antics.

After years of renting properties in various East End towns, Leder plunked down $20 million in November for an 8,000-square-foot, eight-bedroom Sagaponack abode.

And the Sun Capital Partners honcho is breaking it in with a blowout Fourth of July bash expected to draw 600 guests, including Real Housewives Bethenny Frankel and Jill Zarin.

The invite calls for cocktails at 7 p.m. and dinner at 8:30 p.m. There will be a performance by local party-band Booga Sugar and “a lot of surprises,” according to Unik Ernest, an event producer who met Leder two years ago in the Hamptons. Among the evening’s highlights will be a massive tent, complete with a laser-light show.

“He told me it’s going to be very special,” adds Ernest.

One would expect no less from a man dubbed “the Hugh Hefner of the Hamptons.”

“He’s almost like a species that’s in extinction,” raves Leder friend Omar Hernandez, owner of the eponymous West Village clubhouse/restaurant. “He rages into the night,” Hernandez adds. “He will not go gentle into the good night. He likes to have a great time.”

But a great time for Leder, who declined to be interviewed for this article, isn’t always so great for his neighbors.

In 2011, Page Six reported that Leder’s Bridgehampton party guests “cavorted nude in the pool” while scantily clad Russians danced on platforms. (People went for a late-night swim, “but there was no sex,” insists Marc Bell, Leder’s good pal and the former owner of Penthouse magazine.)

Two years later, The Post reported that Leder’s Water Mill neighbors went ballistic over the megamillionaire’s ragers, which included unsightly portable toilets, an endless stream of Escalades speeding through the street, and dozens of mattresses packed into the estate’s theater for Leder’s gaggle of bosomy houseguests, who proudly call themselves “Leder’s Angels.”

Things got so out of control that at one event, it was alleged that Mario Singer, husband of “Real Housewives of New York” star Ramona Singer, publicly committed adultery with a 20-something. (The Singers are currently divorcing.)

Leder received so many complaints and noise violations in 2013, he was only allowed to proceed with his Independence Day party after he made a $10,000 donation to the town, posted a $50,000 bond toward potential party fines, and vowed to stop having parties that year.

Needless to say, Leder’s reputation precedes him — especially on the East End, where old money rules.

“He’s showy and he likes to flaunt,” says one longtime Hamptons-goer who’s attended a Leder party and works in entertainment. (She asked not to be named for professional reasons.)

Another associate of Leder’s, who asked to remain anonymous, says his $900,000 2013 summer rental basically served as a hotel for the bevy of beauties in his rotation.

“He sent out an email to 100 people and literally just had everyone pick dates,” the associate explains. “He had 20 people there a weekend. There was a schedule: 10 o’clock yoga, tennis lessons, private chef, dinner parties . . . he basically buys his friends.”

He rages into the night. He will not go gentle into the good night. - Restaurateur Omar Hernandez, on his pal Marc Leder

And while you can always expect “the best of the best” at the financier’s fêtes, which are more or less “high-end weddings,” according to the associate, some of the guests tend to be, well, a little less high-end.

“It’s low-denomination people,” she says.

“It’s a wannabe party,” adds the Hamptons-goer. “His people want to be seen. They’re trying to get there, but they’re not even there yet. They’re a level below Real Housewives.”

Friends promise that the divorced Leder is more than just a money-tossing philanderer on the hunt for new arm candy. (“Some of those women you might see him with are friends of his daughters,” Ernest clarifies.)

He’s a philanthropic force who loves connecting people, says Dr. Leonard Hochstein, a plastic surgeon in Miami, where Leder also owns a $15 million penthouse.

“In the middle of the dinner party, with 25 people, he has everybody change seats to make sure everybody has a chance to talk to somebody other than someone in their comfort zone,” says Hochstein, who attended the Galápagos trip with his wife, Lisa, a “Real Housewives of Miami” star.

“He makes everyone feel special. He’s charming,” agrees the anonymous Leder associate. “Every girl thinks she’s ‘the one,’” she adds.

Bell experienced Leder’s thoughtfulness firsthand after Bell drove 20 minutes to Friendly’s (which is owned by Leder’s company), only to discover that the shop’s Fribble machine was broken.

“I wrote Marc an email complaining,” says Bell, a self-professed Fribble fanatic. “And he went ahead and hand-delivered me a Fribble the next day. He could have had his assistant do it . . . It just goes to show what type of person he is.”

Who he is today is quite different from the publicity-shy man of yesteryear, sources say.

Raised in Great Neck, LI, he graduated from the Wharton School at the University of Pennsylvania in 1983 with a major in economics, working his way up from an analyst to a senior vice president at Lehman Brothers before co-founding Sun Capital Partners Inc. in 1995.

Leder married Lisa Weisbein in 1987. The couple divorced 22 years later amid allegations that the then-46-year-old Weisbein was having an affair with her 23-year-old tennis pro. Weisbein and Leder are now “best friends,” says a source. Weisbein even hopped aboard the Galápagos cruise with her new fiancé, a life insurance salesman based in Florida. (Leder brought a date of his own.)

But sources say Leder — a father of three girls and one boy ranging in age from 3 to 23 — isn’t planning to settle down again anytime soon.

“He started earning more money and started being able to do more things,” Bell says of Leder’s newfound appreciation for fast living.

In 2011, he hosted a New Year’s Eve bash in St. Barts for 150 friends, complete with neck massages, manicures and pedicures. He purchased two sports teams — the Philadelphia 76ers and the New Jersey Devils — in 2011 and 2013, respectively, and counts Sofía Vergara’s ex Nick Loeb and Russell Simmons among his friends.

Andrea Correale from Elegant Affairs, a premier event planner based in NYC, says Leder fits right in with the excess-is-back Hamptons.

“It was almost in bad taste to show [your wealth] for a very long time,” says Correale. “People are starting to loosen up a little bit.”

And, to the delight of Hamptons scenesters, nobody is looser than Leder.

“All the big socialites, they entertain privately . . . but for the jet-setter, this is the party right now,” says Norah Lawlor, founder of Lawlor Media Group, who scored a coveted invite to the July Fourth fiesta and says she’s had countless “calls asking if I know him or can get them in.

“He’s really the only game in town.”

Hamptons hosts with the most: A look at this season’s VIPs (Very Important Party-Throwers)

David Ganek

Expect fireworks on the beach and on the walls at the Meadow Lane home of Ganek, who ran the hedge fund Level Global Holdings, this weekend: His personal art collection includes works by Jeff Koons, Cindy Sherman and Diane Arbus.

James Chanos

It’s the 20th year for hedge fund manager James Chanos’ Independence Day bash. His giant clambake on the beach of his Further Lane manse, where Jerry Seinfeld, Larry Gagosian and Tommy Hilfiger are neighbors, attracts a wide range of guests and promises a surprise DJ.

Ron Perelman

If past years are any indication, the billionaire investor’s annual August fundraiser for Harlem’s Apollo Theater will be one of the season’s most stellar Hamptons events. Held at “The Creeks,” his home on Georgica Pond, the evening has included performances by Sting, Pharrell Williams and Jon Bon Jovi — even Perelman has been known to jump onstage and join the jam.

Julie Macklowe

The socialite, former hedge fund manager and current cosmetics queen will host VH1’s Save the Music event on Aug. 8 at her Sagaponack spread. The 500 guests will be entertained by a 45-minute Jason Derulo performance. “This is a production; he is coming with his whole team,’’ says Macklowe, who hopes to raise $1,000,000. Hannah Bronfman and Brendan Fallis will deejay.

Ivan Wilzig

“Sir Ivan,’’ the banker-turned-performer known for his debauched parties, is having a disco-themed bash on Aug. 22 to celebrate the release of his new record, “Kiss All the Bullies Goodbye.” “My parties are better than all of them,’’ boasts Wilzig, whose medieval-style Water Mill home will be lit in a rainbow of colors, with 300 bottles of rosé Champagne to be poured.

— Beth Landman