There is no one national past time in Ireland. Irish people do lots of things for leisure. In terms of sports, Ireland's two national sports are Gaelic Football and Hurling. However, Irish people partake in many other sports and recreational activities too, like Golf, atletics, walking, climbing, cycling, sailing, Rugby, horse racing and many others. So there is no single answer to your question.
At this time there are no national parks in Northern Ireland
No. You would need a national identity document, ideally a passport.
The Lapwing is not the national bird of Ireland. There is no official national bird of Ireland.
Ireland does not have a national grass.
the Flute is the National Instrument of Ireland
The national languages of Ireland are English and Gaelic.
There is no official national bird of Ireland.
Ireland does have a gross national product.
National Army - Ireland - was created in 1922.
National University of Ireland was created in 1908.
National Army - Ireland - ended in 1924.
National Gallery of Ireland was created in 1864.