I hear that at Kansai Gaidai english speakers tend to stay together and don't integrate much with Japanese students and that the academic rigor is very low. Anyone have any comments on this or if there are similar situations?
This is sometimes the case no matter where you go.
I like to have a good mix of doing "foreigner things" with my fellow foreigner friends (i.e., having a get together at somebody's house for drinks, movie, whatever... not a very Japanese activity), but I also have things that I do with Japanese friends.
Every university has a pretty nice variety of "bukatsu" (club activities), and if there's one you're interested in, I'm sure they'll very happily let you join.
You can do baseball (they probably play with a rubber ball, but it's still baseball), "footsal" or soccer, basketball, maybe American football (depending on the school), kendo, judo, karate, tennis, brass band, jazz band, rock bands, and all sorts of other stuff. There'll be organized drinking parties for the whole club from time to time, and probably if you become good friends with a small group within the club, you'll find yourself going out with them sometimes too. Also a lot of clubs might do onsen stayovers in the countryside, or ski trips during the winter, things like that. It's a very big social outlet for Japanese students, and a good way to make friends with Japanese people and not just other exchange students.
Hope that helps!