1. On April 1, 1946, a massive tsunami struck the Hawaiian Islands. The devastating waves were caused by a magnitude 7.8 earthquake in the Aleutian Islands, and they caused extensive damage and loss of life on Hawaii's shores.

2. In 1986, the Hawaii State Legislature officially designated April as "Hawaii's Jazz Appreciation Month." The month-long celebration of jazz music includes concerts, exhibitions, and other events aimed at promoting Hawaii's vibrant jazz scene.

3. Hawaiian Airlines, the state's largest and oldest carrier, was founded on April 1, 1929. Today, Hawaiian Airlines is a major player in the Pacific airline market, serving more than 30 destinations throughout the region.

4. On April 1, 2016, Hawaii became the first state in the United States to raise the legal smoking age to 21. The law, which took effect on January 1, 2018, prohibits the sale, purchase, and possession of tobacco products by anyone under the age of 21.

5. The Hawaiian language has a unique counting system that only goes up to 99. However, on April Fools' Day, Hawaiians play a trick on the unwary by claiming that the number system goes up to 150. This practical joke is known as "humuhumunukunukuapua'a" (pronounced hoo-moo-hoo-moo-noo-koo-noo-koo-ah-poo-ah-ah), which is actually the name of the state fish.