Mt. Waialeale

There’s only one company currently permitted to take groups of trekkers back in along the bumpy Wailua Forestry Management access road—Aloha Kauai Tours—and they only offer short day hikes into the surrounding valley. If you don’t have 4-wheel drive—and many rental cars don’t—this might be your only option for trekking access other than hiking the more than 10 miles down the road to the trailhead. To get to the actual mountain base, it’s another several miles through thick jungle, which is easily bypassed in a helicopter tour.