My invitations wording is:
Together with their families
Me
and
FH
Request the honor of your presence
On Saturday, the fifteenth of August
Two thousand and nine
At half past ten in the morning
As they set sail on life's greatest voyage
And tie the knot aboard the
Carnival Destiny, Port of Miami
Reception to follow
My response card wording is:
Take the helm and respond by July 1, 2009
M___________
__ You beach ya' we'll be there for the wedding!
__ Ahoy mateys, we'll set sail with you all week!
__ Sorry, we're docked somewhere else that day.
Then I added a little card reminding people about the wedding website for the rest of the details. I like the way I did the response cards but most people who are sailing with us checked off both of the yes responses so it could have been a little more clear. HTH