Tips/Advice

[Schaapje]

[Iraira]

Bring a few condoms, they don't take up that much space in the suitcase.
Beyond that, you're on vacation, in a place where no one knows you, meaning, you can create the persona of the person you'd like to be. Not hard to maintain that for a month. It's not like the girl and you are going to have a long "real" relationship where she gets to know the real you, while you are in J-pan, so let your "representative" personality do the talking.
Should you get laid, using this alter person, you may later decide whether to incorporate aspects of that person into the areas you feel are defective in your personality.
Just remember, no homicides please....