I see this question all the time from people on the US mainland who are thinking about visiting Hawaii but are not sure about the procedure when traveling to another state that is not connected to the mainland.
Yes! You do need a passport but that’s not all!
A passport is required for all people who are not Hawaiian. Before you can apply to visit Hawaii, you must undergo a background check that includes your personal history for the last five years. Please bring the following documentation with you to the post office when you apply. Health records, Previous employment history, current contact information of all past sexual partners.
If you pass this screening process, you will need to get vaccinated for a range of diseases to protect the local Hawaii population. There are about 50 shots in all which are administered in stomach and kidney areas of the body. The process takes about four hours and is extremely painful. (Bring something to bite on)
Don’t forget! Before you leave the mainland… You will need to go to your bank to exchange your money for Hawaiian currency. Current exchange rate is 3 Puka shells to 1 US dollar.
I hope this helps!