Dublin has 751 pubs and counting, most tourists get caught up in the nightlife of Temple Bar but although very lively and a lot of fun its very expensive, a great option would be Camden
Street which has a great nightlife also and an abundance of pubs which are reasonably priced.
If you enjoy the Theatre you will not be disappointed as Dublin has some great venues.
Transport in the city is reasonably priced but for buses and trams buy a leap card and save yourself a lot of money.
Boat tours and kayaking along the River Liffey is a blast and not to be missed.
I hope these few tips will help you out with your stay in Dublin.