Haleakala ("house of the sun") Crater is located in Haleakala National Park. It towers 10,023 feet above sea level, which makes it a popular place to watch the sunset and sunrise. Entrance to the National Park is $25 and valid for 3 days.
Also, if you plan to watch the sunrise here, you will need to make reservations ahead of time. We attempted to make reservations about two months prior to our trip and it was already booked. Luckily, you do not need to make reservations to watch the sunset from the summit.
Some tips before you go:
-Make sure you have a full tank of gas
-Take plenty of warm clothes (gloves, hat, jackets, blankets, etc) since the temperatures can drop below freezing
-Leave plenty of extra time to park and get a spot. Although no reservations are required to watch the sunset, the parking lot is small and does fill up fast.