Father used to live in Japan for like 15 years. Lol, he know.
Sushi bars (food is very expensive, believe it or not, most sushi is a delicacy. He went to a business partners house for dinner one nite and they told him that this food was purchased with 1 weeks worth of income) Also it is fun to see the floating boats on the water going around the shefs tabel carying the sushi.
Nite life, in Osaka Japan the nite life is wonderful. Lights, music, parades, and entertainment.
In Tokyo, there is a bar right by the BIG airport, i remember went their one nite after I got in and they had this amazing martini thingy...sorry kinda random but yea. And also in Tokyo go into the train stations, you will never see so many people, that was freakin funny for me.
FYI restaurants in Japan are not a big, thing, life there can be very poor for most people. Let me tell ya, back when I traveled their my dad made 450k a year, he made more money that a entire flat;s residence. So you may want to look twards the tourist stuff. Been like 20 years sorry man...lol