That's not an island. This is an island:

http://www.privateislandsonline.com/longocau.htm

"This private island is immense, so big, in fact, that there are actually 4 countries in the world with a smaller surface area"

8700 acres (3520.77 ha) US $1,250,000

Although this one is nice too:

http://www.privateislandsonline.com/galloousny.htm

"This immense private island in Lake Ontario, 17 miles (27.4 km) from Watertown, is the second largest private island in the US. It features 15 miles (24 km) of shoreline, including 3 miles (4.8 km) of rugged cliffs. Sand, stone and pebble beaches line its shores, which also features 2 natural harbours for protected docking. A 23 mile (37 km) road network criss-crosses the island, and a 4000 foot (1219 m) airstrip provides direct access. The main residence is an 8-bedroom lodge, complete with cathedral ceilings, fireplaces, and a large deck. Also present is a 2-bedroom caretaker's cottage, clubhouse with concrete deck and dock, generator building, and a historic lighthouse. A herd of 400 deer make their home on Galloo, and the island is a sportsman's dream. Included with the property are 2 yachts, a ferry, a small plane, and 2 trucks. A 3 acre (1.2 ha) mainland property with boathouse is also included, and is 6 miles (9.7 km) from the island."

Sadly, it's been sold.