I've been on two boat cruises. One on the Danube with a choral group. We gave concerts along the way. When we were eating, the only way we knew we were on a ship was to look out the window and see the shore going by. Soooo smooth. Sometimes we did the traveling at night, and could hear the boat going through a lock.
The other cruise was in the Caribbean. Our daughter and her family were on the sail boat for 2 years. We visited for 10 days in March and again in December for 2 weeks. There were seven of us on that boat meant to hold four. We did sew on that boat. We needed a flag for each country we visited; lots of countries in the Caribbean. Bill decided to sew them, and I was his helper. That didn't go real well because his sewing machine could have used some servicing.
And the Caribbean can get quite rough. We had to wait for a "weather window" to leave a port. But I surely enjoyed it.