Help with response card

[ashleyunf]

We are having our wedding on a cruise. We are not giving our family and frineds the option of not sailing and still coming to the wedding since we only get 50 guests who would not be sailing, and there is no way to decide who those 50 people would be. So we created typical invitations that let out guests know the wedding is on a cruise. Now we dont know how to word the response card. any suggestions? Please help!!
Thank you

[starchild]

I would just word it as if the cruise is the only option, and those who aren't able to take the cruise will let you know.  Then  maybe you can extend to them the option to attend otherwise?  I'm not sure I understand the question but I think that's what you are trying to decide.