Lot of places:
Perth: nice pretty town. Go watch ladies' slippers, a kind of orchard only grown wild in an area not far from Perth. They bloom some time in spring.
Merrickville: Go see the canal lock, a little bit of shopping. Also a nice town.
Manotick: About 20 some miles south of Ottawa, also a pretty town.
Wakefield: North of Ottawa in the Quebec side.
You can google any of those places and find out if they have any special event before you go.