We miss you
A cruise ship passenger is someone who is on a cruise ship during a cruise.
You use the internet.
Maybe, if that person schedules an appointment to go on a cruise ship.
The mail boat carries mail to islands and countries. A cruise ships carries people and tourist from land to land.
The cheapest and easiest way is by e-mail.
You shouldn't try to send fresh flowers by mail yourself, but there are companies that do ship arrangements by mail. You could ship pressed flowers, though.
You send it by mail. :)
Send, ship, deliver, post
It is the same on any ship "man overboard". Only yell it if someone really is overboard, since the cruise ship staff will respond as if it is an emergency.
it means to ship. to send someone or something, means to ship it.
To contact someone on a cruise ship, you can typically use the ship's communication services such as onboard phones, email, or messaging apps. You may also be able to leave a message with the ship's staff or use satellite phone services if available.