No Wedding Gift, Need Money

Hello,

I am surfing the web looking for ways to help my neice with her wedding invitations. She and her husband to be have been together for 13 yrs and have a house and all the appliances they need. However they have never really been on a vacation and would like to have a nice Honeymoon but don`t have the money to go. I thought if we could find a nice way to insert something into her wedding invitations that she will have a wishing well inlue of gifts?
Do you have any suggestions for wording that wont sound so tacky?

Thanks, Dottie