In states, it is very natural for us to smile for greeting. However, Japanese is not raised to smile when greeting, unless you are a close friend. It is weird to say this, but when you visit Japan, don't smile around. Japanese would think that you're from the lala-land.
Just like how it is over-acted on TV, Japanese will bow for greeting. Respect is everything for Japanese culture, especially to the elders. So you may see younger person giving bow as a body gesture while elder person is just nodding. Although among close friends, they would wave hands for greeting. No hugging for sure... unless they are VERY close friends and haven't met for long time.
Many Japanese people (especially in big city like Tokyo, Kyoto, Osaka, Fukuoka, Nagoya, etc.) are now getting used to shaking hands for greeting (by having business with companies from foreign countries). But unless you are there for a business with that person from the company, don't even bother to shake hands... most of them would be thinking of what you want, unless that person have visited USA in the past.
Just for a point though... if Japanese person is smiling while you're asking them a question or so, they're most likely being shy while trying to understand what you're saying (looking through their brain for that vocabulary). I guess it's a psychological thing... If you visit Japan's McDonald, you'll even find it there stating, "Service Smile costs 0 yen." This tells you that Japanese doesn't smile unless it's a service to strangers.
Oh another point! When foreigners visit USA, UK, Australia, Canada, you'd expect everyone to speak English to ask a question. But when English-speaking people visit Japan, you'd expect them to understand English. This is very false. (Just think... how equivalent is your skill of second language in high school vs that country's person's fluency of that language) And when you ask / talk to them, talk to them slowly by breaking word-to-word. They're not deaf, you don't need to yell. (I had that experience.. I almost smacked that person)
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