I don't believe you have to declare leaving the country with currency - just bringing it in. You'd declare it to U.S. Customs. I believe it is customary to leave a tip as well.
[Moderator note: federal law requires reporting when transporting in the aggregate over $10,000 of currency into the US from another country or out of the U.S. to another country. Please see thread links below.]
Last edited by Ocn Vw 1K; Dec 4, 2009 at 10:08 pm
Reason: To avoid confusion as to the law.