Ottawa has great parks with good bike paths if you like fresh air activities. (You can see 'em on Google Earth.) One famous part of the bike path goes along the Rideau Canal, which is the oldest continuously operated canal in North America. It's got a whole series of locks, and winds past the city's most historic areas. Also, they've got a farmers' market, if you're homesick. You didn't say if you wanted outdoors activities, but this is a great time of year for such.
All this from friends who moved there and love the place.