Although Hawaii is a "damn good place to be polyamorous", Federal law is not. Intending to immigrate to the USA for purposes of engaging in Polygamy would make your new "wife" inadmissible and ineligible for an immigrant visa. Lying about the intention would make her both inadmissible for material misrepresentation - that one lasts for life - and deportable eventually as inadmissible at the time of entry.
Inadmissibility
Answered on Oct 31st, 2015 at 9:23 AM