There are a few things you should not travel without:

* A map, certainly
* Photocopies of your passport and visa.
* Cash in US$ 20’s and $ 100’s.
* A folding umbrella if you plan to visit during the rainy season. The wettest months are July and August.
* Zip lock bags. They are cheap, disposable, and keep all kinds of things fresh and dry.
* Hotel cards: You should keep your hotel cards or brochures to show people to get guidance in case of missing way back home.
* Business Cards. You will discover that practically everyone in Vietnam has a calling card of some kinds. The proper way to offer your card is to hold it by the corners with both hands.