Beef is one of my favorite foods. Especially Kobe beef. Have you tried it?
I did - I had some when I was in Japan.  It was amazing - I can't remember which wagu breed I had though
Japan sounds like such a cool place to visit! 
Yes.  Japan was isolated from the west of the world from 1635-1854, but they are now quite more integrated
Wow! Japan seems so far ahead with technology and stuff that I never would have expected that they spent so much time isolated.
Yes they had a great navy starting in the 1st millenium, which peaked during the 16th century before they became secluded
What happened to cause their isolation?
They had rulers who wanted it.  Beyond that I am not sure
What other Japanese foods did you try when you went to Japan?
Lots of fish and riso and miso soup