Some good places were already listed. When my girlfriend came up last month, we went to a number of places in Halifax. She loved it.

-Citadel Hill
-The Public Gardens (great place to take a slow stroll. Especially now with the weather getting nicer)
-Maritime Museum of the Atlantic
-Aviatian Museum (across the highway from the airport. Kinda fun. ^_^)
-Point Pleasant Park
-There’s a dinner theatre off Barrington Street.

Don’t take her to the Natural History Museum. They’ve been tearing alot of it apart inside, and there’s almost no displays worth seeing at the moment. You might enjoy it, but it was a lower point in our trip.

Also, the Nova Scotia International Tattoo is playing, July 1-9. I don’t know if she’s staying till then, but if she is, it’s definitely worth checking out. Also, I think the Buskers are playing soon, aren’t they?