若米國有人手頭有euro, 不妨換些.
其它,就沒啥必要了.
護照最好放旅館的保險箱裏.
再make a copy of your passport, put it online.
Just in case that your passport is stolen or lost.
you can use your copy of passport to get into US consulate to get a new passport.
Otherwise, it will be very difficult for you enter into US consulate.