Hana Highway (Maui, Hawaii)

Sixty-four miles of coastal majesty pack 620 curves and 59 bridges, 46 of them one-lane, making the Hana Highway the densest concentration of raw natural drama on any US road trip. Waterfalls cascade at nearly every turn, black sand beaches like Wai'anapanapa contrast against turquoise coves, and bamboo forests tower overhead — all within a single, slow three-hour drive. This route delivers more waterfalls per mile than #10 Tail of the Dragon, which offers no comparable ocean views. Plan stops at Twin Falls for a refreshing swim, the Seven Sacred Pools in Haleakala National Park for iconic photos, and prepare for occasional motion sickness; the payoff is 30% more biodiversity than the average coastal highway.