Haleakala National Park: Spanning 30,000 acres from the coast to its 10,023-foot summit, this park has a larger concentration of endangered species than any other national park and features the dormant volcano, Haleakala, which hasn’t erupted for 400 to 600 years. Visitors can explore the otherworldly summit and watch the sunrise, or visit the Kipahulu District on the east side of the island where waterfalls and pools can be seen.
Iao Valley State Monument: Home to the iconic Iao Needle, this is the site of the Battle of Kepaniwai, where the forces of King Kamehameha I conquered the Maui army. The 4,000-acre state park features Iao Needle, a landform that rises 1,200 feet from the valley floor. In 1790, Kamehameha the Great’s army defeated Maui forces here, in the Battle of Kepaniwai (the water dam), named after the way fallen warriors blocked the river.