What would be your top pick for a spring break trip?

Sounds like you're going to do alot of driving. Out to Grand Canyon in March, then return home, then out to Pacific Coast a few months later?

Grand Canyon south rim elevation is 7,000ft and can still get snow in March. Maybe do Big Bend and Carlsbad Caverns in March, then Grand Canyon on your way to or from Pacific Coast?

There is so much to see in the West!