We've stayed at the Zion south entrance campsite three times that I recall over last 20 years or so, and really enjoy being able to walk to shuttle trams; and more importantly being able to ride our bikes into park without getting on main roads.
Short tandem ride to end of loop early in morning (about 8 miles each way more or less) still ranks as one of my most memorable cycling experiences. It's not every day you get a beautiful road to yourself that's closed to traffic.
__________________
|