Lots of things to do and see in Dublin. The Book of Kells in Trinity College.........The Guinness Hop Store.........Kilmainham Jail............Christchurch and St. Patrick's Cathedral where they are filming Series 4 of the Tudors so you may be lucky and see some of the outdoor sets.
I would suggest you get the City Tour Bus .....last time I checked it was 15euro p.p. and it will take you to all the places of interest.

Eating out depends on what type of food you like.......there are lots of Bistros now around the city and Reception at your hotel should be able to advise you.

If you like shopping.......well at the moment all the major stores are having great sales...............

Enjoy your time in Dublin.....