Yo, Larry. Get on with your trip, everything's packed. Good luck, buddy!
There are some things you should remember. Don't say aloud all your thoughts, and for god's sake don't act all of them out either! With people, be friendly, but not gross. Keep your tested friends really close, and I mean really close, they are that valuable. New friends --- well, don't trust just anyone. Dude, what's wrong with you? Don't keep getting into fights. But if you find yourself in one, fight like hell! Make everyone afraid of ever fighting you again.
Listen to people - but keep your mouth shut. They'll give you advice for hours, but it's better to keep your opinions to yourself than to yap. When it comes to money, feel free to spend some, but dude, no ostentatious crap, okay?
Don a nice suit. People will think well of you, especially the French. Don't borrow money - and why lend it? A friend you lend to might not pay you back, and then you lose both the money and the friend! That sucks! And if you keep taking on credit, you will forget how to save, and then what?
Most importantly - be true to your character. If you're honest to yourself, you will be honest with everyone else. Isn't that just grand?
Good luck, safe travels! Remember my advice, Larry-O!