I'll be visiting these, probably in this order:
If I were going to skip one, it should be Canyonlands, as that has the lowest number of visitors.
The reason for this order -- Zion park has almost double the number of visitors as Arches.
Weather: Zion, Bryce Canyon, Capitol Reef, Canyonlands, Arches,
Flights: United there/United back, United there/Frontier back (add $55 for baggage fees)
Best trails: Zion, Bryce Canyon, Canyonlands, Arches
== Zion NP