Take her to Blue Bayou for lunch or dinner. It's pricey, but the ambiance is very unique and unforgettable. Everyone should experience a meal there at least once. Be sure to make a reservation and request a waterside table.
Yes, definitely get her a "First Visit" button, she will get a lot of one on one from the CM's when they see it.
I agree with a special meal, BB or CO are great choices. Take her to the PPH and get a Kitchen Sink sundae to share.....it's huge and is served in a kitchen sink! LOL