ship with usps, they have to obtain a search warrant to open packages. split the shipment up in separate packages, don't just send the 8 oz. all at once in a giant box. triple vac seal your herb and put that in a moisture barrier bag. of-course do your best to disguise the package as another item (by splitting up the herb into multiple packages this becomes easier).
also, make sure your hands are clean before you handle the packaging. by this i mean don't go take 3 bong rips then pack up your bud, not a good idea. wipe down the bag o' buds to rid the outside of your packaging of all smell. with the amount of time it takes for your package to arrive in Hawaii a triple vac sealed bag should not become permeable, but if you've already got smell on the outside then...you see lol.