WoodchuckII,
I lived in Hawaii for many years. First off, Hawaii is nowhere near as prohibitive as CA with regards to the AR platform. 30-round magazines are fine, no bullet button required, flash hiders, pistol grips, collapsible stocks and bayonet lugs are fine. Registration is required for all pistols and handguns bought into the state. A one year long gun permit is required to purchase rifles or shotguns and you can walk out of the store with as many as you like but have to take thrm to the police station to register within 3 days. A permit to acquire (14 day wait) is required for all handgun purchases. I would regularly buy two or more on one permit to reduce the hassle. You can buy as many handguns on one permit as you want. HPD were always polite, friendly and very interested and enthusiastic about firearms. ARs can be used for hunting pigs and you can hunt all year round with numerous zones to choose from on Oahu and other islands. You can hunt with dogs too.
As for skiing, you'll need to be hardcore for that. It's not like heading up to Tahoe for the day.
One more tip, check out OGC Tactical .... best gun shop in Hawaii with good, knowledgeable people.