Hawaii is a diverse place. Windward, leeward, mauka, makai, each is a different microclimate, not to mention what island are you gonna call home?
Depending on where you finally land is when to ask the questions. What will work out in the scrubland of Kanio may not work the same in the rainforest of Nahiku.
Either way, it's a really easy place to grow really good weed. But it's an expensive place to call home. The time where you can move to Hawaii, grow weed and build a little empire are long gone, gone with the sugarcane fields. Good Luck.