Hi Susan. Nice pics. Zion's canyons sure are photogenic.
I would like to add to the suggestion pool: For shots like this, set exposure manually. Spot meter on the brighter & darker areas so you (not the camera) can decide what compromise you want between lost highlights or lost shadows.
And for shots like #2, all is not lost if you are willing to cheat a bit with PP. Here I took the liberty of fixing #2. I hope you are ok with that. Basically I just added a masked, reduced opacity gradient layer for the sky. And I cloned onto a new layer to replace the blown cliff face, again with reduced opacity to make it blend / more realistic looking.
You can easily do better working off of the full size original. And do better still if you have a separate shot with better exposure of the same cliff face to clone from. (Effectively, this is HDR w/o requiring good alignment.)
Cheers.