There is two things going on. Quarantine for arrivals to State and stay at home for everyone for City and County of Honolulu and other rules which may be Island/county dependent. Info is available on the respective websites. If you are an arrival, I think you are going to be filling out the form before you get off the plane declaring your place of quarantine. I recommend everyone educate yourselves in advance. You will likely get educated along the way. Don’t set yourself up for more than you bargained for.How exactly are they going to enforce this? Do they post a guard outside your hotel room? Is the Hawaiian government converting the local high school gym into the quarantine central lock down facility? The honor system? On people who disregarded the governors request they not show up to begin with? Maybe the governor is hoping enough people are scared by this so called quarantine that they decide to cancel and it pushes airlines to just cancel their flights.
Things are changing quickly. Take a look at the Hawaiian Airlines site. You might not even be able to arrive. These orders have teeth.
Also, it is not normally referred to as the Hawaiian government. Just a minor point on common usage.