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Even if you're not hiking, carry durable rain gear made of a breathable material, and dress in layers. Good, sturdy, broken-in hiking boots, a hat, and warm gloves are a must, as are polypropylene long underwear and layers of wool or fleece for hikers. Avoid cotton. Bring insect repellent, binoculars, and a camera. Park water isn't safe to drink, and past the park entrance there's no food except what you bring in yourself—and don't forget to get a mandatory bear-proof container for it from the park headquarters.