Where else but Hawaii can you surf, snorkel, and snow ski on the same day? In winter, the 13,796-foot Mauna Kea (Hawaiian for "white mountain") usually has snow at higher elevations—and along with that, skiing. No lifts, no manicured slopes, no faux-Alpine lodges, no après-ski nightlife, but the chance to ski some of the most remote (and let's face it, unlikely) runs on Earth. Some people have even been known to use body boards as sleds, but we don't recommend it. As long as you're up there, fill your cooler with the white stuff for a snowball fight on the beach with local kids.