what is the best way to prepare for an interview for travel as a tourist at the US Embassy?

Answer 1

Be prepared with clear, succinct and truthful answers about why you are going, where you are staying, who you will be meeting, how much money you have available, etc. Just answer the questions, don't volunteer information, unless you feel it will help.

Have with you any paperwork to back up the information you give.
Good Luck, hope you have an enjoyable trip!