Here's some stuff I learned:
When you're in a communist country, don't put a bottle of homemade rice wine with a cobra floating in it into your checked baggage. They'll find you.
If you get caught with a bottle of homemade rice wine with a cobra floating in it at the airport in Hanoi and brought to a scary back room, don't try making a joke. They won't think it's funny.
Don't ride through a small village with 3 people on a motorbike meant for two. Especially if the driver doesn't have a license, none of you speaks Vietnamese, and none of you is wearing a helmet. Why? Because one of you will get arrested.
Don't hire a limo driver for the day in Bangkok just because it's cheaper than it would be in New York. He will assume you are a millionaire and only take you to expensive jewelry outlets.
Don't sleep on the 24-hour trip back. You'll find yourself awake at 4am the next evening on your blog.