New years in Dublin, you are in for a treat. It is a great city to bring in the bells with.
There are loads of great restaurants in Dublin worth looking at. You can find an extensive list of the ones registered with Tourism Ireland here
As for Hotels where you could have dinner, The list would be just as extensive.The Merrion
is very popular as is the Fitzwilliam Hotel
and The Marker Hotel
You can find further options from the list here
if you need them.
I hope this helps you out but if you need any further advice, let me know.