Come to the cabaret, old chum. In fact, you can see a show much the way the Rockefellers and Guggenheims may have in the early 20th century.

Broadway stars Karen Mason and Lee Roy Reams sing in an unlikely setting tomorrow night: Castle Gould at Sands Point Preserve, a building on the former Guggenheim estate that's a replica of a famous Irish castle.

One of a handful of such shows hosted throughout the year, the cabaret here is set inside the castle's carriage house. When the space, now a ballroom, is set up with a stage, dining tables and candles, the effect is reminiscent of a roaring 20s-style nightspot.

"We are not just another venue," Jean-Marie Posner, executive director of the not-for profit group Friends of Sands Point Preserve, says of the historic building. "Our great hall has a lot of significance."

The night of music and dining includes a signature cocktail, dinner and dessert fit for Jay Gatsby and Daisy Buchanan.

SING AND DINE

Mason and Reams have performed together before -- but singing cabaret-style calls for an energetic approach with a closer connection to the audience than stage performing, Mason says.

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"Both of us love the Great American Songbook," she says. Expect to hear some Liza Minnelli and Judy Garland. Reams is a fan of the composer Jerry Herman ("Hello, Dolly!" and "La Cage aux Folles").

The ballroom can accommodate up to 175 people, but to personalize the experience, tables can be arranged for two, four or any combination that best suits the attendees.

Says Posner, "It's a very intimate kind of thing."

ABOUT THE CASTLE

Part of a complex of homes on the estate, Castle Gould was owned by Howard Gould in the early 1900s. The 100,000-square foot-limestone structure was used mostly as quarters for up to 200 servants, and the carriage barn. Built originally as a home, it was modeled after Kilkenny Castle in Ireland.

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Daniel Guggenheim purchased the estate in 1917, and in 1923 gave 90 acres to his son Harry Guggenheim, who then built the seaside mansion Falaise on the property, where he entertained celebrities and tycoons in the fashion of wealthy Gold Coast living. Guests such as famed aviators Charles Lindbergh and Amelia Earhart once stayed there, and pictures of them with the Guggenheims adorn the walls of Castle Gould.

The estate is now owned by Nassau County, and is open to the public for tours and use of the grounds.

"Best of Times" Cabaret

WHEN | WHERE 7 p.m. Saturday at Sands Point Preserve, 127 Middle Neck Rd., Sands Point. Reservations required.

INFO 516-571-7901, thesandspointpreserve.com

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COST $120 (includes dinner and open bar)

OTHER EVENTS

Earth Balloon

WHEN 11 and 11:45 a.m., 12:45 and 1:30 p.m. April 26 for ages 4 and older. Registration required.

COST $25 a carload

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Kid-friendly but also interesting to adults, visitors can step inside a 19-foot inflatable model of the earth to get a view of the continent as it can be seen from outer space.

Fitness classes

WHEN Yoga: 11 a.m. Thursdays and 9 a.m. Fridays. Adult meditation: 11 a.m. Mondays.

COST $10 parking per carload

Yoga and meditation classes are offered in single-class sessions. No need to register. Bring a mat and water. Family yoga classes are also offered a few times a year.

Long Island LitFest

WHEN 1-5 p.m. May 31

INFO 631-754-6363, longislandlitfest.com

COST $20 a person, plus $10 parking

A series of live nonfiction readings from writers including Susan Isaacs and Dick Cavett, plus book sales and signings.