It’s not easy to find the entrance to Artemis, a new bar in Ronkonkoma’s Station Yards. And that’s exactly the point. The bar is a speakeasy of sorts, named for an old rumrunner that plied Long Island waters during prohibition.

What better place to commemorate the centennial of "The Great Gatsby," the F. Scott Fitzgerald novel on the Jazz Age that’s considered among America’s best novels? Well, perhaps you might also want to head to Port Washington for a boat tour of Gatsby-era mansions, check out the "Gatsby at 100" exhibit of art and memorabilia at the Long Island Museum in Stony Brook or browse a vintage shop for flapper regalia. And that’s just for starters.

"People really love to step back in time," Artemis co-owner Ed Fabian said. The bar has "no TVs, no windows — people don’t realize how much they miss socializing without distractions. I look around at our customers, and almost no one has a phone out." As to the Gatsby era, in general, he said "it’s kind of sexy ... that era of getting dressed up and being fancy."

Speaking of dressing up, vintage shoppers love accessories from the 1920s and '30s, said Jacquelyn Conte, owner of Wit & Whim in Huntington. The era makes her think of opulence — she has several vintage mesh purses in her cozy shop, along with bracelets and one rare spider pin.

"What draws me to the Art Deco era lies in its bold elegance and geometric precision," she said. "It’s one of my favorites," she said, especially the clean lines and "the way it captures a spirit of optimism and progress."

If you don’t want to eat, drink or shop, just get in the car and visit one of the many grand mansions that harken back to the Roaring '20s. Even 100 years later, it’s relatively easy to get the Gatsby vibe.

Tour Gold Coast mansions

VANDERBILT MANSION AND PLANETARIUM

180 Little Neck Rd., Centerport

The sprawling mansion known as "Eagle’s Nest" was the Vanderbilt summer home for many years. Tours highlight Jazz Age opulence along with William Vanderbilt’s passion for collecting — things like shrunken heads from Peru and a sterling silver cigar piercer from Tiffany & Company.

• COST $14 adults, $10 seniors and students with ID, $8 ages 11 and younger; 10 a.m.-5 p.m. Tuesday-Sunday;
• MORE INFO 631-854-5579, vanderbiltmuseum.org

SANDS POINT PRESERVE

127 Middle Neck Rd., Sands Point

The three grand mansions that were the Guggenheim estate — Hempstead House, Falaise and Castle Gould — feature 216 acres of gardens perfect for strolling or bird watching.

• COST $15 per car, $4 individual; open 9 a.m.-6 p.m. Wednesday-Sunday
• MORE INFO 516-571-7901, sandspointpreserveconservancy.org

OHEKA CASTLE

135 West Gate Dr., Huntington 

This castle built by financier Otto Hermann Kahn is considered one of the many Gold Coast mansions that inspired the novel. Used frequently as a set (starting with Orson Welles' 1941 classic, "Citizen Kane"), the castle has 32 hotel rooms and a popular restaurant, OHK, where Gatsby Hour is being celebrated Monday-Thursday from 4 to 7 p.m. with $15 bar bites and $12 cocktails.

• COST Mansion tours 11 a.m. daily, $30$10 ages 12 and younger;
• MORE INFO 631-659-1400, oheka.com

OLD WESTBURY GARDENS

71 Old Westbury Rd., Old Westbury

Wander the lavish gardens at this 1906 estate, and you’ll be living the Gatsby life. The Gardens are running a Gatsby weekend Sept. 19-21, including an Art Deco exhibit, dance classes and two performances of the high-energy jazz revue "The Sparrows" (7 p.m. Sept. 19 and 20, $40). The former home of John S. Phipps stood in for the Buchanan mansion in Baz Luhrmann’s 2013 film adaptation of the novel.

Visitors can tour the gardens or parts of the mansion, including the servants' quarters. Join a Roaring Twenties themed weekend in celebration of the 100th anniversary of F. Scott Fitzgerald's novel, "The Great Gatsby," with dance classes, foxtrot and waltz, art displays, silent films, a concert and more (fee for activity sessions). Concert at 7 p.m. Sept. 19-20; other events run from 10 a.m. to 5 p.m. Sept. 20-21.

• COST $18$8 ages 7-17
• MORE INFO 10 a.m. to 6 p.m. Wednesday-Monday, through Oct. 31; 516-333-0048, oldwestburygardens.org

COINDRE HALL

101 Browns Rd., Huntington

Overlooking Huntington Harbor, the 1912 mansion was built for pharmaceutical magnate George McKesson Brown. Now primarily a catering hall, the grounds are popular with dog owners who let their pooches frolic on the grass (generally open dawn to sundown).

• COST The arts organization Splashes of Hope runs a free tour at 11 a.m. the last Saturday of the month, call 631-424-8230 for reservations
• MORE INFO 631-854-4410, suffolkcountyny.gov

PLANTING FIELDS ARBORETUM

1395 Planting Fields Rd., Oyster Bay

Railroad and insurance magnate William Robertson Coe thought of his summer home as a "country cottage." Now the 409-acre estate is a state historic park, offering everything from chamber concerts to painting classes.

• COST Guided or self-tours of the main house are offered through Dec. 1 (see website for fees/times); 9 a.m. to 5 p.m. daily except Christmas
• MORE INFO 516-922-9210, plantingfields.org

Browse vintage shops

BACK IN TIME

441 Main St, Farmingdale

Get in some evening shopping Fridays through October and enjoy live music from 5:30 to 8:30 p.m., with snacks like pizza, beer and wine. Shop for furniture and decorative items from the 1920s and '30s, along with early technology (think cameras and telephones).

• MORE INFO 516-586-8443, backintimedecor.com

THE TIMES VINTAGE

429 Main St., Greenport

The two-story building was once a newspaper office (The Suffolk Times). Now it’s packed with a carefully curated selection of vintage attire (including some replica flapper dresses) and accessories like gloves and long beads for women and fedoras and suspenders for men.

• MORE INFO 631-477-6455, thetimesvintage.com

GOOD GROUND ANTIQUE CENTER

52 W. Montauk Hwy., Hampton Bays

With 12 different dealers, this shop has a huge variety of merchandise from the '20s and '30s. Find costume jewelry, as well as tableware like silver candelabras, vintage china, crystal and flatware.

• MORE INFO 631-728-6300

PAPER DOLL CURIOSITY SHOPPE

33 E. Main St., Patchogue

Enamel mesh purses from the 1920s have vibrant colors even 100 years later, so they’re coveted by collectors. You’ll find these, along with jewelry like a multicolored Art Deco brooch and a graduated glass bead necklace.

• MORE INFO 631-730-8383, shoppaperdoll.com

WIT & WHIM

187 Park Ave., Huntington

This cozy little carriage shop has accessories from the era, including hand-beaded purses from France, Art Deco jewelry, as well as decorative items like iconic nude bronze statues.

• MORE INFO631-470-0424, wit-and-whim.com

REMEMBER YESTERYEARS VINTAGE CENTER

901 Montauk Hwy., Oakdale

Play the flapper in a satin cloche and glass beads from this co-op and jewelry center, with more than 100 dealers. If you don’t want to dress the part, a vintage drawing of a flapper is a frisky reminder of the era.

• MORE INFO 631-654-3052, rememberyesteryears.com

See a show and explore an exhibit

GREAT GATSBY BOAT TOUR

405 Main St., Port Washington

A member of the F. Scott Fitzgerald Society narrates a two-hour cruise around Manhasset Bay and Long Island Sound. The boat has two levels, bathrooms and a bar.

• COST $65, $50 ages 17 and younger, Sundays through September; boat leaves from Inspiration Wharf
• MORE INFO 917-526-0597, bigapplefanaticstours.com

THE SPACE AT WESTBURY

250 Post Ave., Westbury

Opened in 1927 as the Westbury Movie Theater, the classic Tudor screams Gatsby era. The building originally seated 1,600, but fell into disrepair. Saved from demolition, it now hosts concerts and, in October, a martial arts event.

• MORE INFO 516-283-5569, thespaceatwestbury.com

SWING DANCE LONG ISLAND

Huntington Moose Lodge, 631 Pulaski Rd., Greenlawn

Jazz Age parties included lots of dancing, from the Charleston to the Lindy Hop. Get your groove on at Tuesday night dances sponsored by this organization dedicated to swing dancing. No worries if you have two left feet — get there at 7:30 p.m. for a quick lesson.

• COST Dancing from 8 to10:30 p.m.; $5-$15 on DJ nights, $10-$20 if there’s a live band
• MORE INFO 631-476-3707, sdli.org

CINEMA ARTS CENTRE

423 Park Ave., Huntington

Movies from the 1920s are on the bill at the monthly "Anything but Silent" film series, which features classics from the silent era along with live organ accompaniment. See the horror double feature "Nosferatu" and "Phantom of the Opera" (Oct. 8), Conrad Veidt in "The Man Who Laughs" (Oct. 21) and Jazz Age star Constance Talmadge in "Her Sister from Paris" (Nov. 18).

• COST $18
• MORE INFO 631-423-7610, cinemaartscentre.org

LONG ISLAND MUSEUM

1200 Rte. 25A, Stony Brook

Portraits of F. Scott Fitzgerald and his wife, Zelda; first editions of "The Great Gatsby"; and even Zelda's ostrich feather fan are on display in "Gatsby at 100." The celebration of Fitzgerald's work runs through Oct. 19.

• COST $15, $10 ages 6-17 ; 11:30 a.m.-7 p.m. Thursday and 12-5 p.m. Friday-Sunday,
• MORE INFO 631-751-0066, longislandmuseum.org

Have a cocktail at a speakeasy or restaurant

ARTEMIS

3 Hawkins Ave., Unit 1110, Ronkonkoma

This is not the spot for a beer and a Mets game. Customers are heading to this hidden speakeasy for the relaxed vibe and a cocktail list that hearkens back to the Gatsby days (though, of course, the gin, bourbon, etc. are perfectly legal now).

• OPEN 4 p.m. to midnight Tuesday-Thursday and Sunday and 4 p.m.-2 a.m. Friday-Saturday;
• MORE INFO 631-266-8534, artemisspeakeasy.com

THE JAMES

21 Fire Island Ave., Babylon

What would Jay Gatsby have for dinner? Beef Wellington, perhaps, with a plate of oysters and a martini (very dry, of course). This restaurant in a historic building in downtown Babylon welcomes diners with elegant Art Deco flourishes and a menu to match.

• OPEN Wednesday-Monday
• MORE INFO 631-975-2637, thejamesli.com