Our freeways are so small that there is no point in having a highway patrol. Now we have state areas like the airport, state office buildings, and others that are patrolled by not only HPD, but sheriff. Sheriff has jurisdiction for state property. Now we have harbor police which of course is harbors and ports. We also have US customs and border protection which does enforce reports of cruise ships and or planes with illegal activity. But everything else, KPD, HPD, MPD and Hawaii police department has jurisdiction over. Hopefully that answers your question
But on another note, our state is not big enough to have a state police. The closest thing we have is the department of public safety, sheriff, which is kinda considered our state police