boat trip; sea voyage; cruise
Refers broadly to travel by boat or ship, from a ferry trip to a longer sea voyage or leisure cruise.
During summer vacation, I took a boat trip to Hokkaido.
I got a little seasick on my first voyage by ship.
The boat trip to Okinawa was really enjoyable.
The couple set out on a sea voyage for their honeymoon.
My grandparents enjoy a cruise every year.