There's an APP for Zion National Park!

The Zion National Park app, an indispensable resource for anyone exploring the 7th most visited national park in the United States, delivers a 45 minute audio tour of Zion Canyon, a high-resolution GPS-enabled map, constantly updated ranger led activities, over 75 photos and much more.
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Users can view sunset and sunrise times for the most memorable scenic overlooks, plan hikes, review key safety information, learn about over 250 points of interest and access a complete list of facilities including locations of all the restrooms, campgrounds and picnic areas in the park.
Like the Grand Canyon National Park and Yosemite National Park apps that preceded it, the Zion app boasts a rich and impressive map interface that is custom-made, GPS-enabled, includes every hiking trail in the park, and displays interactive points of interest. Unlike other apps for the park, the map works without the need for a cell or data connection and is specifically designed for the mobile app platform.