Hmm... Japanese traditions, eh? I practice a couple/few.
Just recently, I started celebrating White Day; which turned out to be a good day--aside from the fact that people were confused as to why I'm handing out gifts.
I bow--like all the time, I drink ocha (green tea) like there's no tomorrow, my best friend and I sip sake on the weekends (not to get drunk or anything, just a couple of samurai relaxin' with the sake), I read the Hagakure about twice a year (that's not really a custom), I take my shoes off before entering the house, I say "ittekimasu" when I leave and say "tadaimasu" when I come home, whenever people leave or get ready to get off the phone with me I say "Ki o tsukete ne" (take care), and I eat just about everything with chopsticks.
I think that's about it, although I may be lying to myself. ^_^