We just got back from the Euribia. , For the theater shows, you have to book the day of (or the night before) when the activities for the day become available in the MSC for me app. There was a shuttle to Rotterdam Centraal station but I did not see an excursion to Amsterdam. However, it was a short walk from the ship to a Metro stop, then we rode the D train to Rotterdam Centraal, I think that was 4 stops. At Rotterdam Centraal, we got a train to Amsterdam Centraal, that ride was about 40 minutes, It was very easy, we only speak English and had never been to Europe before. As long as you can tap in and out of the gates for the subways and trains, you won't have trouble. I did put an app (NS, I think) for the Netherlands Rail on my phone, which made it easy to see train times.