If you have a date in mind, I would call DFTW and get your date reserved. When you say "surprise your wife with a vow renewal" what exactly do you mean? If you're going to surprise her within the next week or two saying that you've scheduled the date and time, that would be very romanic. But, not sure you would want to show up at Disney and say "oh, by the way, we're renewing our wedding vows on Tuesday". She might want some planning time to get a new dress, etc. The planning was part of the fun for me. Although, you know your wife so maybe she would be thrilled if she made all of the arrangements.