Bryce Canyon is very scenic with great photo opportunities, and especially great if you are lucky to get there after a snowstorm. Also, I would not miss Capitol Reef N.P., which is basically east of Bryce. High on everyone's list is Zion. The Moab UT area has 2 parks, Arches and Canyonlands. If time allows Monument Valley and The North rim of the Grand Canyon should be seen. If you go between now and spring the North Rim will be closed.
Enjoy your trip!
gpmoab