This Mauna Kea summit tour takes you to the summit for sunset, and then stops along the way down the mountain, where guides give visual lectures (dependent on clear skies) using lasers. They focus on major celestial objects and Polynesian navigational stars. The excursion departs from Hilo and costs $187.50 per person, including parkas and hot beverages. Pickup is available from Hilo hotels. If you drive yourself and park at Puuhuluhulu, across Mauna Kea Access Road, the cost is $166.77. The price is even lower if you stay at their traveler's lodge, which offers tent camping and semi-private rooms.