Ken, vacation rentals are already illegal in residential zoning. They are allowed in resort zoning. Property owners do not have unlimited property rights and cannot do whatever they want with their property. That issue was settled in 1926 by the US Supreme Court with Village of Euclid, Ohio v. Ambler Realty Co. case. The court ruled local and state governments can restrict land-uses. If Hawaii had no zoning laws, how much agriculture and preservation land would we have?  The purpose of residential zoning is to provide housing for residents, not mini-hotels for tourists.