Best cheap stuff to do in O-town: walk along the canal(very romantic at night)
-watch the sunset from Major's hill park (behind the chateau laurier)
-pull up a chair on any patio in the byward market,enjoy a pint and people watch
-check museums websites..they often have 'free'times. National Gallery of Canada is just a spectacular building to walk around in, never mind all the amazing art works.
-climb the peace tower on parliment hill.
-don't try a montreal day trip...it's like trying to visit DC and daytrip to Boston. Both cities deserve more investigation.
Ottawa hits it's stride in the summer and the music festivals are some of the best in the world. The Jazz festival line up is always eclectic and always amazing. Enjoy our city, it's beautiful!