Yes there is.
The same as any first world country. It varies based on your income and cultural influnces.
Cultural traits.
There are many to choose from. Any of the national museums. The National Art Gallery. Trinity College Dublin. The Dublin Writer's Museum. Newgrange.
Northern Ireland is part of the island of Ireland.
Ireland is a country. It is not in any state.
All the precambrian animals were weird ;P
Ireland is independent, so it is not ruled by any other country. Northern Ireland, which is different to Ireland and may be what you are referring to, is part of the United Kingdom.
No, you do not need any vaccines when you travel to Ireland.
Ireland is a neutral country and as such does not have enemies.
There are many hills and mountains in Ireland.
ireland main airports
yes it is called the Ireland gazett.