We chose this cruise for the itinerary. No other reason. We were nervous to try Norwegian because we love Holland America so much.
All but two or three ports require tendering. The actual ports were usually far from the city centre. The price NCL wanted for excursions were bring worthy. At each port we took taxis, 1/2 hour train rides, hour long public bus rides, to get to see the things we wanted to see. Anyone who can work google maps can do this. It was easy.
There were no Irish entertainment on board, just excursion sales pitches.
We visited the Belfast Museum and the area where the Troubles were.
We took a train to city centre and a bus to see the Blarney Castle.
We took a city bus to a town, and rented bikes to see the cliffs.
We took a train to city centre and visited the emigration museum and Temple Bar. You should make reservations if you want to see the book of Kels.
We took a bus to an industrial area and rented a car. We drove to Ballina in County Mayo. We drove to the cliffs of Moher and the Burren.
This port was not prepared for a cruise ship to visit. Unless you are die hard Waterford Crystal, there isn't much there. It was about 40 euro in cab fare to the town. The actual port is a nice area to just walk around in.