There is a book and DVD about Walt's life - maybe they could be added to the basket.
The name of the book is "An American Original - Walt Disney" I forget who wrote it though. The DVD is similiar (and I believe is also available on video - if he doesn't own a DVD player).
You might also be able to include a video or DVD of a Disney Classic - one that will make her laugh.....Mickey and Gang can bring a smile to anyone's face.
You might also want to find out which resort they will be staying at maybe it is possible for one of the bakeries to make a favorite cookies, cakes, etc. for them to share.
Just a few suggestions, I probably could think of more - as I don't know if they would want to wait until they get off of vacation in order to watch a DVD.
Best Wishes - This is very sweet of you to look into doing this for them,
Jodi
Hey - thought of another one, maybe a couples spa treatment

Grand Flordian's Spa is fantasic!