The English phrase "Are you doing Hawaii?" is not grammatically standard. It might intend "Are you going to Hawaii?" or "Are you from Hawaii?" There is no direct Hawaiian equivalent for this incorrect construction. For travel questions, you might ask "ʻOiaʻiʻo ʻoe i Hawaiʻi?" (Are you going to Hawaii?) or "No Hawaiʻi ʻoe?" (Are you from Hawaii?).