Did you know that koa wood is endemic to Hawaii? The koa's trunk was used by ancient Hawaiians to build canoes, surfboards, paddles and weapons. Now days it is also used to make ukuleles, guitars, furniture and jewelry. Commercially, koa is one of the most expensive woods in the world. It's reddish tone and amazing grain is highly prized. Its name in the Hawaiian language, koa, also means brave, bold, fearless, or warrior.