When you deplane in Aruba, you will need your passport or an original state-issued birth certificate with a raised seal and a photo identification.
The migration officers in Aruba may want to be sure that you have reserved a hotel room, a rental house, condominium or made other lodging arrangements for the duration of your stay. If you plan to stay with a friend, have him write a letter that includes contact information. Keep the letter handy for inspection.
The Aruba migrations officer will want to be sure that you have the money you'll need to pay for your room and other travel expenses. A bank statement, sufficient cash or other proof of means are important. There are specific laws against working while you're in Aruba on travel, and it's part of the migration officer's job to ensure that visitors are not taking jobs from locals. Be sure to exchange your currency at the airport or your bank before your trip. In lieu of this, a written guarantee from a legal resident of Aruba may also be acceptable. Finally, there is a "passenger facility charge" of less than $40 per person. Also called the departure tax, this fee is waived for visitors who are in Aruba for less than 24 hours.
You may need to provide a re-entry visa. If you are required to have documentation in order to return to your country, Aruba migrations officers will want to ensure that you have them ready, including a filled out and signed Embarkation and Disembarkation card.
In Aruba, they will want to be sure that you have scheduled a trip home. Make sure you have a copy of your itinerary confirmation from your travel agent, a printout of your e-ticket or your actual return ticket.