Where are you staying? The Holiday Inn Express on Hastings?
Not a lot of places to eat right near the Coliseum. (Don't think the area can support an eatery as there used to be a restaurant across the street that went thru a number of incarnations before it finally just converted to a school.)
Closest eateries are on Hastings and Renfrew area. While I wouldn't consider any places nearby as gems but there are a few decent joints to grab a bite if you want to stay in the neigbourhood.

Attached to the Holiday Inn Express is a pub. Had a relative muster here after their building was evacuated. I didn't eat here but the evacuated people were saying that the food was ok. Pub grub.
In the Exhibition Plaza strip mall (at least that's what I think it's called), there's:
Dijo's: Pizza shop. Whole pizza's and by the slice. A little pricey but you generally get a more generous amount of toppings. Had my first pesto pizza here. I find it a bit inconsistent and slow tho (small operation).
New Gourmet Castle Restaurant: Sushi and asian/Chinese food. Haven't been here in ages. What drew me in the past was that they had some really good combo meals.
Blow Fish Sushi: Small "hole-in-the-wall'ish" sushi joint. Decent quality and pricing on "most" items. Been here a few times. Ordered a salmon teriyaki on one of their bento boxes and I think they grilled up a nice slab of salmon that was destined to be sashimi. A few of their rolls came with 8 pieces vs the usual 6.
Tom & Jerry's: Haven't been here in ages also. They have an all you can eat fish and chip special and also an all you can eat pasta special. I think they're something like $10-15. Varied menu with a bar.

Down the street (to the west) is a Vietnamese restaurant called Bao Chau. Decent pho and spring rolls here. Note, there's another Vietnamese restaurant on this street called Petit Saigon (which I haven't been to yet).

There's a Burger King and Subway nearby too.

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Tangent... The lunchtime chef for the Cannery opened a place called the Pink Peppercorn Seafood House. There was a small blurb in the Sun a few days ago saying the chef recreated a number of the Cannery menu items with dishes going for about 1/3 less. My buddy checked them out last week and he said the food was ok but the service was crazy slow. He was thinking he was in a Ramsay Kitchen Nightmare/Hell's Kitchen episode where it took forever to get food out. Pricing wasn't a bargain as he though it was going to be either. Looks like they need to get some kinks out.