Unless you possessed the gun in Hawaii before 1949, you need to registerwithin 72 hours upon arrival.
You can not have pistol magazines that hold more than 10 rounds.
Contrary to popular belief, this does NOT apply to rifle/shotgun feeding devices. You can have a 30 round mag for an M-16 or AK-47.
Hawaii does not have an AWB; however, they do have what's called an "assault pistol" ban.
As far as a permit to carry, forgettaboutit.
You may want to buy a couple of more guns before moving there. It's a lot easier that way.
If I moved to Hawaii, I'd keep some guns out of state and bring a couple that I wouldn't mind registering, I guess it's just a privacy issue with me.
Hawaii's gun laws can be found in Chapter 134.
Hope this helps.