Oh gosh, if only I lived in Markham...
J-Town is rather small, but it's a lovely group of Japanese businesses squished together to make up this shopping centre. There's a small bakery within the convenience/snack store, and they also sell Japanese kitchenware and bentos.
The baked goods are quite delicious, and I stocked up on some rare snacks to eat later on when I get back home. If you're hungry, there's a few restaurants nearby- unfortunately, they do not have the lunch menu after 3pm, and you can wait until 5pm for the dinner menu, or you can go elsewhere for food.
Overall I would love to come back, but it's way too far for me to even consider visiting again, really. I also wish it was bigger- J-Town is practically the size of a peanut.