I find with almost any coffee shop I can work on writing, unless I’m completely not in the mindset (which has happened from time to time). But frequently if I don’t write at the coffee shop, I can still get in excess of the NaNo daily once I get home. (Except this month. It’s only when I’m writing at the coffee shop that I get the word count I need in the day. growls at self)
There are a couple of good Starbucks for that, two good Second Cups, the local coffee shop Coffee Matters - the one in my city/town is within easy walking distance of me - and I’m going to try The Mad Catter at some point over the next month or so. (The last is a cat café, and I want to see whether being crawled over by cats at a coffee shop works as well.)
Note that I find the Tim Hortons to not be good for writing - quite frequently they don’t have outlets, and they seem to be noisier than the other coffee shops. I know it’s practically blasphemous, being a Canadian and not liking Timmy’s for writing in, but I’ve got Second Cup for that.