Depends where you're headed! I'll just list a few random spots off the top of my head (without getting too dox-y haha)
In Grand-Pré, NS, there's Just Us Coffee House, which is a coffee co-op with a focus on fair-trade and sustainability.
In Sackville, NS, there's Cranewood Bakery and The Roost Café which I've both been hearing good things about.
If you're in Moncton, NB, definitely check out Epoch Chemistry, especially if you're into lighter roasts. They roast in house and their baristas are very knowledgeable and friendly. I highly recommend their coffee tasting flight!
If your trip brings you to the Acadian peninsula (which I recommend on its own, lovely places and people around there!) La Boulangerie Grains de Folie in Caraquet is a must, as well as Aloha Café in Lamèque.
That's cool! I'd love to learn more about that side of things. My current boss has a side-hustle as an espresso machine repairman; I should really ask him to show me a thing or two.