"For older kids and adults who are adventure-minded, this bike ride is a popular choice. There are several companies that provide all the necessary equipment to bike down Haleakala, and offer guided tours, as well as a few that run more self-guided trips, including Haleakala Bike Co., which has been in business since 1995. Here’s the idea behind this bike adventure: You’re dropped off to explore the impressive summit of Haleakala (10,000-plus feet)—if you do an early morning ride, you get to watch the sunrise from the edge of the enormous crater (about 7 miles long and 2 wide)—and then, for safety reasons, you’re taken to a starting point outside of Haleakala National Park at 6,500 feet. From there, you zoom down 23 miles of Maui switchbacks to sea level."