This is the 8713th most frequent German word.
kreuzfahrtschiffen
"Creuzfahrtschiffen" is the dative plural form of "Kreuzfahrtschiff," meaning "cruise ships" in English.
In this sentence, 'Kreuzfahrtschiffen' is used as the plural dative form of the noun 'Kreuzfahrtschiff', indicating the ships involved in the activity described (i.e., traveling daily).
Die Kreuzfahrtschiffen fahren täglich von Hamburg nach Oslo.
The cruise ships travel daily from Hamburg to Oslo.
Here, 'Kreuzfahrtschiffen' again takes the dative plural ending, showing the location or objects of interaction, specifically in relation to the visitors during the tour.
Besucher können die Kreuzfahrtschiffen während der Hafenführung besichtigen.
Visitors can view the cruise ships during the port tour.
'Kreuzfahrtschiffen' in this example is the plural dative form used after the preposition 'wegen', indicating the cause of the increased harbor traffic.