I have friends that travel extensively whenever they get the chance and hands down, they swear by the Let's Go series. They've tried all the other ones and that's the one they kept coming back to over and over again.
I would also say to look into some language tapes if you don't speak any Japanese. A little language can go a long when when you're traveling. If you can, get the Pimsleur language discs. Our library has them and I've been learning French and Italian on them and it's really been easy.
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