I can talk about my studying abroad experience in Canada: so cool I did it twice. First time in Burnaby, BC, (high school) and second time in Sherbrooke, QC (university). I found that both times I made more international friends than Canadian friends. Not that they are hostile or xenophobic, they just tend to keep it to themselves and respect personal space. They get enough foreigners that they're neither curious nor ignorant anymore
Most of the time it will be you who will start the conversation with them. I'm living in Canada now and it still is like this.
University can be a stressful environment, since it's expensive and people are trying to get the most of it. Parties, soirées, 5 à 8s were very common, we had one almost every week where you just go, have some drinks, eat some pizza, just relax after classes. My campus had a theatre, a sports centre, and beautiful, beautiful gardens. I lived on campus when I was there and I itch to go back! I miss that place so much...
The town was kind of small though. All the big, interesting stuff happened in Montréal, 2hs away. Not super far, but you have to plan a little bit before going. If you do end up in Canada and happen to choose the Université de Sherbrooke, I'll be happy to share some more tips with you!
As for tips on living in Japan, you could search Youtube, there's plenty of vlogs. My favourite one is Rachel&Jun!
*forgot to mention: while in Montréal you can often get away with speaking English, Sherbrooke is not always so forgiving...