The Zion Canyon Scenic Drive through the main part of the park may be closed to traffic March through November (you have to ride a shuttle), but the Mt. Carmel Scenic Byway is open even during Zion’s busiest season.
The great lawn out front is really inviting if you packed a picnic (there’s also a place to grab pizza and ice cream as well as a full service restaurant). And of course, there’s a great gift shop!