Had to do a one day visit to a site at Dalkey a couple of weeks ago. Right on the shore had a great view of the Ferries heading in and out, luckily had my Panasonic TZ70 in my pocket, most of these taken at full 30x zoom, see more on my Flickr page by searching for Fergusdaddy.
https://www.flickr.com/photos/fergusdaddy/
https://www.flickr.com/photos/fergusdaddy/