Dennis Irene and Alexandra (our daughter)
invite you to their wedding!
september 12 2011
Find your way to Miami, and our cruise wedding is on us!
it sounds like a sales pitch, but we wanna use that last line!
Suggestion:
"Come join us on an all-expenses-paid cruise to witness Dennis Irene and Alexandra tie the knot at sea in Miami on Monday, September 12, 2011. The Captain will ensure the knot they are tying is not a slip knot."

{ 4 comments… read them below or add one }
Sounds great! Go with that.
Sounds fine!
I can't think of anything off the top of my head. Long day. I do like the last line. I like the idea of it being humorous. It took me a minute to figure out that Dennis is the hubby and Irene is you and Alexandra is the daughter. Needs some punctuation. I thought it was Dennis Irene. One name. Try googling samples of wedding invitations. Well renewal invitations. I'm sure you'll figure something out. It sounds like a lovely idea. Good luck to you!
You aren't having a wedding – you are already married. You will only confuse guests; they'll be asking themselves (and others) whether you really married so-and-so.
Perhaps you can call it a "renewal of vows" or an anniversary cruise.
It is never the business (or responsibility) of the hosts as to how guests get to the party. Just announce it:
Michelle and Michael Michaelmass
Request the pleasure of your company
On a four-day cruise
As they celebrate their anniversary/As they renew their vows
Four o'clock in the afternoon
12 September 2011
Name of whacking large ship
Miami Florida
Include a map. On it, you can explain a bit more: the cruise is prepaid, the name of the cruise line, baggage restrictions (if any), bring a passport (if necessary). And indicate, in clear language, that reservations will be made ONLY for those who R.S.V.P by the stated date, or your great-uncle Ernie's great step-son's girlfriend's best friend's aunt will show up at the last minute wanting a free cruise and nosh.