You step off your ship at Dún Laoghaire Harbour and you’re already in good shape. The DART - Dublin’s coastal commuter rail - runs from Dún Laoghaire straight into the city centre, and your return ticket is included. It’s a fifteen-minute ride with sea views most of the way, and it drops you close to where the hop-on hop-off bus picks up.
From there, the DoDublin bus covers 25 stops across the city, with live local commentary through your included headset the whole way round. You’ve got 24 hours on the bus, so you can jump off at the Guinness Storehouse, Jameson Distillery Bow Street, or St. Patrick’s Cathedral and come back to the route whenever suits you. Complimentary admission to the Little Museum of Dublin at St. Stephen’s Green is built in too - normally €15 to walk in, and it’s a genuinely worthwhile stop for understanding the city’s 20th-century story told through donated objects. There’s also a 2-for-1 lunch deal at Murrays Bar on O’Connell Street.
Dún Laoghaire itself is worth a moment’s attention before you board the DART. The East Pier is one of the better walks on Dublin Bay - granite piers built in the 1820s, around four kilometres for the return stroll, and a view back towards Howth Head that most visitors never see from the ship’s deck.
Give yourself a full morning if you want more than a quick circuit. The 24-hour bus ticket runs from when you first board, not from when your ship docks, so the earlier you get into the city the more flexibility you have for stopping off and coming back to the route.
The Little Museum of Dublin is small but genuinely good. It’s at 15 St. Stephen’s Green and holds over 5,000 objects relating to Dublin life in the 20th century - all donated by the public. The guided tours run on the hour and take about 35 minutes. It’s busy on weekends, so arriving just before a tour time works better than wandering in mid-afternoon.
Guinness Storehouse queues can be long at peak times. If that’s your priority stop, aim to arrive when it opens (9:30am most days) rather than midday. The gravity bar at the top has one of the better 360-degree views of the city, included with your admission.
Check what time your ship needs you back on board. The DART back to Dún Laoghaire from Pearse or Tara Street runs frequently, but the last thing you want is to be cutting it fine with a hop-on hop-off bus timetable in the mix. Build in a buffer of at least an hour before all-aboard.