While I am not a fan of American macrobrews, I am a huge fan of Japanese macrobrews. If you don't like lagers, though, you're going to be in for a huge disappointment since 99% of the beers in Japan are lagers, mostly pilsner style too.
My favorite is draft Kirin Ichiban Shibori (it's decent in a bottle or can, but it's WAY better from a keg at an izakaya).
Since other posts are mentioning stuff other than beer, you might also want to try some Japanese whiskey, assuming you like scotch (which Japanese whiskey tastes most similar to). If you like "sake" (which is known as "Nihonshu" in Japan), you might want to try out some shochu, which is very similar to Korean soju. It's made from any of the following: rice, barley, yams, or brown sugar (not mixed. Generally just one of any of those things). The Okinawan version, known as Awamori, is quite different but quite good too.
It is quite ironic that in the US I love craft brews and despise the macrobrews, while in Japan I love the macrobrews but dislike most of the craft brews. I lived in Tokyo for about 10 years and always bought new craft beers whenever I saw them, but I thought most of them were mediocre at best. Personal taste, sure, but just my two cents.