Hawaii is the only state where it is illegal statewide to walk around in public with a rifle or shotgun. If you bring a gun to Hawaii, you must register it and you can not drive around with a gun in transport mode, not a rifle, pistol, or a shotgun... Not even ammo.
You must drive straight to the range, residence, police station, or your place of business without stopping.
Hawaii's gun laws are horrible and they were basically written by the military. They were made worse in the 1970's and again in the early 1990's.
Hawaii never had a gun culture and historically is very anti-gun. That is changing with the younger generation and gun ownership has tripled what it was 15 years ago.
I really wish you could carry a weapon in Hawaii but I'm afraid it's not possible. I carried a handgun in Hawaii and I can honestly say I really didn't feel like I needed it (but I wish you had to option to carry it).
I only carried in Honolulu half of the time I was there. The only time I ever felt I wish I had a gun with me in Hawaii when I didn't was at Alele Falls outside of Kaupo in Maui. There was a wild dog who was very curious and I had to be persistent to get him away from my wife and I.
Back to Honolulu, The far west side of the island (tent city) is pretty ghetto and China Town is not the best place to be at night.
Compared to Flint and Detroit, Honolulu is a crime free area
I hope you find this information helpful and I recommend you go on Amazon and buy Oahu Revealed by Wizard Publications. They gave me so much great information on places to hike and eat at.