Well, you're right about the whole Valentine's Day and White Day fiasco thing in Japan. I'm actually planning on sending some of the men I've met, as well as some close 'girl friends' some chocolate. Unlike back home, I don't really expect anything in return on the day of White Day though. [You know, many cultural differences and its probably too much of a hassle anyway.]

As for the holidays, I mainly know of the ones in Japan and nationwide like Christmas and New Years. There's...kind of too many to mention, to be honest.