I'm leaving the US for good, anything I should do before I leave?
Since this wasn't apparent the last time I asked... no, I'm actually not a US citizen or green card holder (permanent resident). Just happened to be in this country for a long time due to career reasons.
Get an FBI background check, and get it apostilled. Easy to do from your local post office in the US, difficult and expensive to do outside the us, and you will need it for many things you might want to do in other countries
Actually the only time I've ever needed one is outside of the country. You need a police report from anywhere you lived for more than six months to apply for residencies, get teaching jobs, etc etc. the only authority in the US that can do this and provide a report acceptable outside the country is the FBI.