The Okolaheo Trail rises about 1,400 feet over two-plus miles from the Hanalei National Wildlife Refuge. The trailhead is near the Hanalei River, about two miles from the town.
Leave the GPS in the car—only one route is humanly possible—but bring along some hiking poles, since the rooty-and-muddy ascent presents many opportunities to get the seat of your shorts dirty.
Along the way to the summit are a few level spots with views of Hanalei Bay. The summit itself is surrounded by ti plants, but you do get 360-degree views of the river valley and ocean. Okolaheo is called 'The Moonshine Trail' since a rustic liquor was made from the ti plants in the old days.
Complete directions in your handy Kauai Trailblazer guidebook.