I grew up in Ottawa and so have lots to suggest. For me, no trip would be complete without a visit to one or more of the tremendous national museums/galleries. My favourites (in order) are: War Museum, Museum of Civilization, National Gallery, Science & Technology Museum and the Aviation Museum.

A tour of the Parliament Buildings.

Lots of good resto's in Ottawa although my favourite (Nate's Deli on Rideau) has closed

A drive up to the Gatineau and a visit to the MacKenzie King Estate

A visit to the National War Memorial and the tomb of the unknown soldier on Elgin St

A Senators hockey game at Scotiabank Place or the Ottawa 67's (Major Junior) hockey game at the Ottawa Civic Centre.

Hope you have a great trip!