Maui Feature

Hiking is a perfect way to see Maui. Just wear sturdy shoes to spare your ankles from a crash course in loose lava rock. At upper elevations, the weather is guaranteed to be extreme—alternately chilly or blazing—so layers are good.

When hiking near streams or waterfalls, be cautious: Flash floods can occur at any time. Don't drink stream water or swim in streams if you have open cuts; bacteria and parasites are not the souvenir you want to take home with you.

Here's a checklist for what to take for a great hike.

Water (at least two quarts per person; drink even if you're not thirsty)

Food—fruit, trail mix, and lunch

Rain gear—especially if going into the crater

Sturdy hiking shoes

Layered clothing

Wide-brimmed hat and sunglasses

Sunscreen (SPF 30 or higher recommended)

Mosquito repellent (a must around waterfalls and pools)