Visit the Hall.
Visit Flinders (make her walk all the way up to SSS so she truly appreciates the hills I have to walk up all the damn time).
Harbourtown, if she's in the mood to spend money.
Ice-skating, if she's in the mood to be cold.
The Beach House? Paddleboating? Shopping in the city?
Anything I missed out?
And if anyone else wants to come visit, I am more than willing to draw up an Adelaide-visiting plan for you too.