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Many are observing the day by exploring the sites, sounds, flavors and beauty of Hawaii and by using #NationalHawaiiDay to share their experience on social media.
Here are some fun facts about the Aloha State. It's made up of eight main islands. In addition to its breathtaking natural beauty, Hawaii has an important strategic significance.
VIDEO: Fun in the sun at Aulani Resort in Hawaii
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Hawaii has been critical to United States naval operations for decades. That significance was underscored by the surprise Japanese attack on Pearl Harbor in 1941, an event that drew the U.S. into World War II.