06Day 6 · Mauna Kea
Day 6 goes above the clouds. Mauna Kea — 13,796 feet, the highest point in the Pacific — holds the clearest night sky on earth. The summit is a 1.5-hour drive from Hilo or 2 hours from Kona; the road above the 9,200-foot visitor station requires 4WD. Book a guided sunset + stargazing tour (~$200–280/person) — they handle the driving, the parkas, the telescopes, and the altitude.
The ascent
Tours stop at the Onizuka Visitor Station (9,200 ft) to acclimate for 30 minutes — at the summit there's 40% less oxygen than sea level. The drive above the clouds is otherworldly: cinder cones, observatory domes, the island spread below you. Sunset from the summit is a religious experience; the shadow of the mountain stretches to the horizon.
The stars
After sunset, the telescopes come out. The Milky Way is so bright it casts shadows; Saturn's rings, Jupiter's moons, and galaxies 2 million light-years away are all on the menu. The guides are professional astronomers — ask them anything. Note: ages 13–80 only, no scuba within 24 hours, not for pregnancy or heart/lung conditions.
Where to stay
Drive to the Kohala Coast after the tour (about an hour) — tomorrow is the luxury finale. The Four Seasons Hualalai (from ~$1,433/night, just named the #1 hotel in the USA for 2026) is the splurge; the Mauna Lani, Auberge Collection (from ~$800/night) is the romantic alternative.
Bad-weather plan
Clouds kill the stars — tours cancel for weather and refund. The backup: the free public stargazing at the visitor station (Fri/Sat nights), or the 'Imiloa Astronomy Center in Hilo (planetarium, excellent).
Summit: 13,796 ft · 4WD required above 9,200 ft · Tours ~$200-280/person · Ages 13-80
Tip: Book-early rule: the stargazing tours cap group sizes — reserve weeks ahead, not days.