Sushi+Green Tea, must!
Japanese green tea has lots of Vitamin E and C!! compared to English Black tea and Oolong tea. This is because of its manufacturing steps. The Japanese tea is manufactured without fermentation. Its also good for disinfection for food poisoning so it is recommended to drink when eating raw fish, shells or sushi.
Between, the Green Tea KitKat is a must try!! They only have it here in Japan and it is a good souvenir :)