Try:
voiceofdance.co . . .
Click on MESSAGE BOARDS then the category AUDITIONS and THEN enter the search term "cruise" in the search box. All the major lines post their auditions there.
If you are serious, you will have to probably go to Florida as all the major cruise lines have their home offices there. If you are a serious dancer, you will have to travel, that's just part of the business. They won't come to you.