Due to the overwhelmingly popularity of viewing sunrise atop the 10,000 plus foot Haleakala, the National Park Service is requiring reservations starting February 1st, 2017. Reservations may be booked online at recreation.gov up to two months in advance and until 6:00pm HST the day before a planned visit. The NPS will hold 30 tickets to be made available one day in advance, also until 6:00pm HST. Tickets are not available on a first-come, first-served basis at the park or at the entrance station. The reservation fee is $1.50 per vehicle and is separate from the park entrance fee. Photo id matching the reservation is required and the reservation fee is not refundable due to bad weather. Entering the park after sunrise hours, 3am to 7am, does not require a reservation.
If booking ahead is not your thing, consider visiting Haleakala at sunset and then staying for the star viewing. No matter when you go, be sure to go with enough gas and food as neither are available in the park. Always bring warm clothes as the temperatures at the summit can drop below freezing.