Try Okonomiyaki and a Chuu Hai
Okonomiyaki is an awesome Japanese dish that is basically a pancake filled with cabbage, meats, and whatever else you'd like. In the Tokyo area, okonomiyaki tends to be thinner, whereas in the Kyoto/Osaka region they get much thicker.
Chuu Hais are a japanese interperation of the Highball drink that uses shochu and seltzer water. They're very refreshing and provide a nice buzz throughout the night.
Be sure to bring your friends!