A good day out from the city centre is a trip to Howth, a fishing town on the northside of Dublin. It's only 30 minutes from the city centre by DART. Howth has plenty of walks and lots of stunning scenery (especially on the Hill of Howth), a pier where you can take a more leisurely walk, lots of restaurants, pubs and shops and yummy fish and chips. Its lovely to visit on a Sunday when there is a farmers market along the pier and there is lots of hustle and bustle.