Open Carry Generally Prohibited:
Except as otherwise provided by law and in subsection (2), it is unlawful for any person to openly carry on or about his or her person any firearm or electric weapon or device. It is not a violation of this section for a person licensed to carry a concealed...
That's all my legal heat app had for the types of carry.
If you have a smart phone pay the cheap fee and get it. A lot of great information on there with all the 50 states listed.
Open Carry Only Allowed With a Permit:
No person shall carry concealed or unconcealed on the person a pistol or revolver without being licensed to do so. Haw. Rev. Stat. § 134-9.
Obtaining a Permit is Extremely Difficult:
In an exceptional case, when an applicant shows reason to fear injury...