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Zion National Park

Zion is hands-down one of the best parks in the region for hiking, with everything from half-hour treks to multi-day expeditions for all ability levels. Adventurous hikers will love two of its most iconic—and strenuous—trails: Angels Landing (5.4 mi) and The Narrows (16 mi, pictured), a slot canyon still being cut by the Virgin River. You'll hike through the flowing river, so dress accordingly.