Ikea is coming to Brookyn.

One of the Big Apple's most isolated neighborhoods will soon see its meager mass transit system boosted big-time for a long-anticipated IKEA invasion.

IKEA officials yesterday revealed plans for how they plan to pacify Red Hook, Brooklyn once thousands of shoppers start heading there daily on June 18 when the Swedish home-furniture giant opens its first New York City store on the Beard Street waterfront Highlighting the transportation improvements arranged specifically for the new IKEA is free water-taxi service to and from lower Manhattan.

The service, to be provided by New York Water Taxi, will run every 40 minutes during store hours, said store manager Mike Baker. Water taxis will dock along a 6.5-acre public esplanade that IKEA had to build behind the store to help garner elected officials' support for the controversial $100 million project.

Other transit improvements will include beefed-up bus service and free shuttle service connecting to the three closest subway stops, which are still over a mile away.

But John McGettrick, co-chair of the Red Hook Civic Alliance, says it's not enough and that IKEA will ruin the neighborhood's unique maritime character.

He said that besides lacking subway service, Red Hook doesn't have adequate roads and parking to handle an IKEA- "especially since many customers won't be from Brooklyn and arrive by car."

"There's been no IKEA in this country ever put in a situation like this; most others like the ones in Elizabeth and Paramus in New Jersey have direct access off highways," he said. "This is on a tiny peninsula that is basically a dead end."

Red Hook itself is fenced off from the rest of the borough by the Brooklyn Battery Tunnel and Brooklyn-Queens Expressway, and even the nearest highway entrance on the BQE is over a mile away from the 346,000-square-foot store.

IKEA is offering 1,400 parking spots, although the project's environmental impact statement estimates about 14,000 cars arriving on Saturdays. McGettrick says he believes it will actually be 20,000.

But IKEA spokesman Joseph Roth said he expects most New Yorkers to leave their cars home and use the new transit options.

For example, IKEA is offering free shuttle service every ten minutes from three subway stations: Borough Hall/Court Street in Downtown Brooklyn, Smith/9th Street in Carroll Gardens, and 4th Avenue/9th Street in Gowanus.

And the Metropolitan Transportation Authority is extending the B61 and B77 bus routes to stop directly in front of the store.

Roth said customers could arrange home deliveries, which cost an average of $50 to $100, "instead of lugging heavy items on trains or ferries."

But just in case they want to drive, IKEA officials said the city has agreed to hang over a dozen signs directing drivers from the BQE to IKEA, via the shortest routes on local streets.