I also find dinner to be a bit formal for a first date, and even if you do talk a lot, it tends to veer towards more serious topics. Plus, there's always the awkwardness of the bill, where you'd like to pick it up but don't want to be presumptuous.
I think the trick is to set yourself up for success, so put yourself in a position where you'll look good and the pressure will be off. This will consist of having ready made things to talk about and be in your comfort zone. It sounds like you know this person reasonably well. Any shared interests? Art gallery? Hockey? Music or concerts? Are there any lectures at the University or College that deals with your interests?
I actually think a movie can work well if it's something you both are keen to see. If you can follow that up with a drink or two afterwards at a lounge or a pub, then you're guaranteed to have the movie to talk about, and either of you can grab the bill (or alternate activity payments) without making the other person feel too indebted.
If it's earlier in the evening and not too cold, as someone above suggested, a walk is great.
If you find anything you both like, keep your time together short, sweet, simple, and be yourself, the date should be a smashing success.
Good luck!
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