Day trip ideas to Ottawa

So I'm heading down to Ottawa in just a couple days (Sunday) to see Weird Al at the Canadian Tire Centre, but since I'm going to have to do a two hour drive to get there, I was figuring I'd head out first thing in the morning and make a day trip of it.

I'm hoping some people might be able to suggest some places to check out or things to do while I'm in town? I'll be alone, so more group oriented activities are kind of out. I've been to the Diefenbunker before, and have seen most of the Parliament related tours, so not really looking to do those again.

I'd also appreciate food recommendations for lunch/supper while in town.