Good place to escape to from Dublin if you want to see more of nature. Be prepared for all types of weather, as it is typical for Irish weather to change in a heartbeat. I went in Early November and it was sunny for the most part (hiked in shorts, longsleeves and windbreaker), but it was very windy, hailed briefy, and I just caught the beginning of a rainstorm as I finished.
The tripadvisor suggested loop (http://www.tripadvisor.co.uk/Guide-g212088-i12089-Howth_County_Dublin.html) has you follow the "Bog of Frogs" loop starting and ending at the Howth DART station. While I suggest you print out the trail as a reference, I found it much more enjoyable and scenic to follow the entire coastline, even the southwest of the peninsula. I deviated around stop 18 (Red Rock) and found this side much more peaceful with less hikers. You can continue along the coast until you hit a road and from there it is a short (20 min) walk to the Sutton DART Station.
Also, be sure to hike all the way out to the lighthouse. That was probably my favorite part of the hike.
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