You cannot openly display your weapon while there. I don't think you can transport your ammo either. There are some good gun shops to buy ammo from. And the Koko head shooting range is pretty good , open to public and free. Only 5 rounds can be loaded at a time. There also is an indoor shooting range in Waikiki on Kalakaua, I haven't been there yet but its private and looks like lots of fun. I will probably go there next time I am there. I go to Hawaii, quite a bit when I can. Used to live there and still have family there.