Alongside the city’s historic buildings – its cathedrals and churches,  squares and townhouses, castles, monuments and pubs – you’ll discover, stunning new street architecture. 
The Grand Canal and The Royal Canal are two great locations on either side of the Liffey, both with lovely walks and prime photography opportunities.
Samuel Beckett Bridge - this  bridge shaped like a harp is designed by the Spanish architect, Santiago Calatrava and is probably the most photographed bridge in Dublin. To get across The Ha'penny Bridge  sometimes is quite difficult as so many people stopping to take photos. 
Howth seaside village is so idyllic, if you're feeling adventurous you can go for a cliff walk or  just chill down on the pier and watch fishermen boats coming back. 
Don't forget to stop at Skerries for a beautiful sunset and a portion of ice cream!