They already tried that: https://www.bbc.co.uk/news/world-europe-56592109

The cruise ship operators docked nearby and chartered busses. Or they used smaller boats to circumvent the law:

https://www.theguardian.com/world/2022/jul/25/cruise-passeng...

If they impose too high prices the ships go elsewhere, either a different city or they buy their own land and build their own port on it. While those options don't always exist, they are real enough that most cities dare not push to hard.

This still seems solvable; environmental regulations are almost always stricter at higher levels of government, and charter buses and massive development need to meet those.

Cruise ships stop at different countries as well, if your gets too bad they go next door. There are a number of islands in the Caribbean that don't get much ships. The Mediterranean likewise has a number of countries to go to.

You could prevent Alaska and Norway cruises, and a bunch of others that are mostly one country, but there are lots of other countries for those ships to go to.

But if the people in the article get their way then there would be no cruise ships at all?