The travel situation in Hawaii, both trans-pacific and inter-island has continued to evolve over the last few months. We have seen the installation of infrared temperature scanners in every major airport, as well as tighter screening for incoming travelers. On September 1st the State of Hawaii released the new online Safe Travels application which will be mandatory for all travelers. The application can be accessed here.
In addition to the new application, a 14-day mandatory quarantine is still in effect for all travelers both inter-island and trans-pacific. Inter-island travel was open without restriction for a number of weeks, but when case numbers on Oahu started to balloon out of control, Governor Ige decided to reinstate the restrictions. Travelers who are planning to self-quarantine must provide the name and information for the hotel they are staying in. At this time no short term vacation rentals are allowed to host travelers undergoing quarantine. Here is a list provided by Maui County with approved accommodations.
This page on the Hawaii Department of Transportation's website explains the entrance and quarantine process in detail. In addition to actually going through the quarantine process, travelers will also be required to complete a Travel Declaration Form and an Order for Self Quarantine Form. It should be noted that after the 14-day quarantine period is up, travelers are free to book other accommodations and move about freely. At this time, the pre-travel testing program which will eliminate the need for a 14-day quarantine is set to begin on October 1st.