Honestly, that sounds like a packed 11 days, so I probably wouldn't throw anything else on your plate but there are tons of things to do in the Ottawa area. Gatineau provincial park is incredible. The Nature museum is great. I have some awesome food suggestions at various price ranges. There is really good barbecue at the Smoque Shack in the market. A good friend of mine is the head chef there. Sterling steakhouse on the Gatineau side of the Ottawa river is world class. You can sit on their patio, overlooking the river and Parliament, for lunch or dinner and they'll really take care of you. If you or your wife are wine drinkers, they have one of the best selections in Canada. Bottles ranging from $40 to $75,000.
A real hidden gem on your way down highway 401 east bound from Toronto to Ottawa is a place called Whispering Springs wilderness retreat. It's located in Grafton, and it's essentially high end, luxury camping with 4 star room quality tents, your own hammock, barbecue, deck and use of the pool, couples massages, etc, etc... It's a unique spot in Algonquin park and it's quiet and beautiful... Not sure if something like that would interest you guys for a night, but here is the link. My fiance and I loved it!
https://www.whisperingsprings.ca
Also, if you have time while you're in Ottawa, go see an Ottawa Redblacks game at Lansdowne Park. It's really affordable, the beer is cold, and CFL football is fun live. Worth the experience. It's no weekend in South Bend, but it's great for what it is.