This is a must-see in Maui! From the base of the mountain, it will take you about 30 minutes to drive to the top of Haleakala.
The roads are very twisty, and there are sections where there are no guardrails. Be sure to drive at a pace that is comfortable for you, and utilize the pullover areas to let faster traffic pass. There is no need to make a reservation to enter the park unless you’re showing up early to watch the sunrise. You’ll just have to pay a park entry fee when you arrive at the base of the mountain(don’t worry you can’t miss the payment booth).
The summit is over 10,000 ft from sea level. Due to the elevation, it is pretty darn cold and the air is noticeably thinner. When we went, the base of the mountain was about 90F(32C) and the top of Haleakala is around 50F(10C). Also, it is very very windy at the summit. You should bring a sweater and a windbreaker to make sure you’re able to walk around comfortably.
The view of the surrounding islands and the crater are absolutely stunning! Check out some pictures here: https://creditcarrots.com/haleakala-crater/))