Halfway between New York and New Zealand is the Pacific Ocean. To be more precise, the point in the middle is located pretty much halfway between Mexico City and Tahiti (a little bit closer to Tahiti than to Mexico City, actually). I could not find any island close to this point on my maps, so it appears it's just plain ocean there.
auckland new zealand
Hawaii is about half way to New Zealand from Vancouver BC.
cuba
Wissingers, Pennsylvannia
The halfway point between Calgary, Canada and New York, New York is Minneapolis, Minnesota.
Sri Lanka
Fishkill, New York is halfway between Ossining & Rhinebeck
The halfway point between New Hampshire (NH) and Texas (TX) is Salt River, KY.
The halfway point is New York
hjhjaiauw
Approximately halfway between Henderson, Nevada and New York City is Lincoln, Nebraska.
Tonga is in the South Pacific, halfway between Hawai'i and New Zealand