Thank You Letters For Cruise Interview Sending A Letter On A Cruise Ship!?!?

Sending a letter on a cruise ship!?!? - thank you letters for cruise interview

I want to send a postcard or a letter to an employee on a cruise ship. Is this possible? go on a cruise and my friend wanted me a postcard or something like its 15th To send a one-day cruise. They are the guests can be obtained by e-mail? If so, how? Royal Caribbean is ..... Thank you!