If you are planning on catching an Irish Ferries sailing between Holyhead and Dublin, you have the choice of two boats, the faster Dublin Swift, or the luxurious Ulysses Cruise ship. The latter is cheaper and has a greater range of facilities on board, but takes around twice as long to cross the Irish Sea.
After checking in at Holyhead, passengers are transferred to the boat by free shuttle bus, as they are located a short distance from the terminal.
Ulysses
The Ulysses is an enormous car and passenger ferry, apparently the world's largest car ferry (with the ability to carry 1342 cars and 2000 passengers). The boat has a range of facilities, including cinema, bars, lounges and restaurants. The ship is also equiped with WiFi (additional cost). Cabins are available for passengers (full details and options available here).
Dublin Swift
The Dublin Swift travels at around 80kph during the short crossing. Onboard, passengers have the choice of two bars and two restaurants, as well as a TV lounge, entertainment stage and gaming area. WiFi is also available at an additional cost.
At the Dublin end of the journey, both ferries serve Dublin Ferryport. Dublin city centre can be reached most easily by bus or taxi. A bus is waiting for passengers on arrival at the Ferryport, with journeys to Dublin's central bus station costing €2.50 for adults, and €1.25 for children. If you aren't planning on heading to Dublin, the Ferryport is a two minute walk from Dublin Connolly Station, which has trains to Belfast and Wicklow. If you are planning on travelling to Cork or Galway, catch a tram from Dublin Connolly Station to Heuston.

