The United States operates on 120V and 60Hz. Make sure you bring a converter or plug adapter with you.
Bring cash and international credit cards in order to avoid high currency exchange rates at the casinos.
It is recommended to allow at least three hours to transfer in any U.S. airport to re-check your lugage and or proceed to the U.S. Customs and Border Protection Services or immigration processing.
The form I-94 has been paperless since 2013. Travelers will be provided with a CBP admission stamp on their travel document. If a traveler needs a copy of his I-94 (record of admission) or verification of alien registration, immigration status or employment authorization, it can be obtained on the U.S. Customs and Border Protection website. For detailed information, please check these I-94 automation help pages.