What should I know about doing a Hanoi visa run for a tourist visa?

Yep, a few weeks ago - assuming this is for a tourist visa, it's no appointment necessary but they do close on national holidays. The website's list of requirements is correct for the most part; however, I had the required 20k baht but because my hotel reservation (which they ask for proof of) was payment on arrival, they factored that in and told me I needed a bit extra in the account, I think it was around $600USD in the end. It was processed in 2 working days for me but can take longer. My advice is give yourself a little longer than you think you might need in Hanoi to get it sorted to be on the safe side.