Dun Laoghaire East Pier Walk - On a sunny day take the DART to Dun Laoghaire and stroll down the East Pier to the Lighthouse. Buy an ice-cream and bask in the sun on one of the many benches on the pier. Also, Regatta sailing can be watched on Wednesdays and Thursdays and on Sundays.

Dalkey - near the train station on Ardeevin Rd, go up the hill behind and you can see over Dublin Bay towards Howth

Killiney - the Vico Rd, stunning view over Killiney Bay (compared to the Bay of Naples by some )

Sandyford - The Blue Light pub, Barnacullia,   https://www.facebook.com/pages/The-Bl... stunning views over Dublin bay, Dublin Bus #44B http://www.dublinbusstuff.com/PhotoWe...  from DUNDRUM LUAS station (in the village, NOT the Balally 'Dundrum Town centre' one ) http://www.dublinbus.ie/en/Your-Journ...

Howth - The Summit inn,  https://www.facebook.com/pages/The-Bl...  great views of the sunset over North Dublin http://www.dublinbus.ie/en/Your-Journ...  Dublin bus #31/A/B (look for the 'v' on the timetable - this bus goes over the Summit hill  ) http://www.dublinbus.ie/en/Your-Journ...