die Kreuzfahrt
cruise
A vacation trip on a large ship during which you visit different places and ports.
Nächstes Jahr machen wir eine Kreuzfahrt durch die Karibik.
Next year we're taking a cruise through the Caribbean.

cruise
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cruise
A vacation trip on a large ship during which you visit different places and ports.
Nächstes Jahr machen wir eine Kreuzfahrt durch die Karibik.
Next year we're taking a cruise through the Caribbean.

The word is made up of 'kreuz' (from the verb 'kreuzen', to cross/cruise) and 'Fahrt' (journey/trip). It describes a trip where you often cross the seas in different directions, not just a simple trip from A to B.
Unsere Kreuzfahrt führte uns zu fünf verschiedenen Inseln.
Our cruise took us to five different islands.
In German, a cruise is normally not 'genommen' (taken), but rather you 'macht' (do/make) it. The most common and natural combination is 'eine Kreuzfahrt machen' (to take/go on a cruise).
Meine Eltern haben letztes Jahr eine Kreuzfahrt im Mittelmeer gemacht.
My parents took a cruise in the Mediterranean last year.
To describe the travel route, you often use the preposition 'durch' (through) for a region or 'im/auf' (in/on) for a specific sea.
Wir planen eine Kreuzfahrt durch die norwegischen Fjorde.
We are planning a cruise through the Norwegian fjords.
shipping / boat trip
'Kreuzfahrt' and 'Schifffahrt' both have to do with travel or traffic on water. A 'Kreuzfahrt' is a vacation trip on a large ship during which you visit several places or ports. 'Schifffahrt' is more general: it can mean all traffic by ship, including transport and the economy, or a single trip by ship or boat. They can be confused because both are connected with ships. When it is about a vacation with several stops, 'Kreuzfahrt' is more precise. When it is generally about ships or a simple trip on the water, 'Schifffahrt' fits better.

Meine Eltern machen im Sommer eine Kreuzfahrt durchs Mittelmeer.
My parents are taking a cruise through the Mediterranean in the summer.
Die Schifffahrt auf dem Rhein ist wegen des Nebels heute eingeschränkt.
Shipping on the Rhine is restricted today because of the fog.