Don't forget your passport!
Since you will be leaving the USA on this trip, don't forget to apply for your passport at least 3 months in advance. It will be important to give it as much time as possible to process, as expediting the application can be very expensive.
To find out more about the passport application, visit travel.state.gov.
Honduras issues a free 90 day tourist visa for US citizens. Interns are responsible for marking tourist on their immigration forms. Buen Viaje!