Ok - with such limited time I would skip Zion. You really need to be able to take extra days there to hike up into areas like the Narrows and Angel's landing in order to get decent images.
With that in mind I would definitely hit Bryce. It's an easy drive in and there are lots of opportunities for landscape shots with short hikes or even just from the pull outs.
The Navajo and Queen's Garden Trails near Sunset Point are short hikes with great landmarks and opportunities to capture classic shots. If you are really limited and can only spend one sunrise or one sunset I recommend Sunrise Point. Contrary to the name it is great at both times of day.
Continuing East there are some terrific places along highway 89 heading toward Page, AZ.
After Kanab, UT... at approximately mile 20 you will find a small unmarked pull out on the north side of the road (your left hand side driving from Kanab toward Page. Sign in (the sheet should say something about Toadstools or Mushroom rocks), enter through the cow fence and follow the well worn foot path... sometimes it dips into the dried up river bed... after about 15 minutes, 20 if you walk slow you will find yourself at the Rimrock Hoodoos. These are great any time, morning or evening... one of my all time favorite spots.
Horseshoe Bend is a great place for landscapes too:
http://www.travelsw.com/southwest-tr.../horseshoe.htm