It really depends on what strikes your fancy.
For example a fun first trip to Monument valley is to get to Gouldings for an early lunch, see their little Museum, be at the gate for the self guided driving tour by 1pm, for sunset be back at the campground or "The View" hotel early enough to take a walk with the camera and find a nice place to photograph the Mittens. In the morning be up early for backlit sunrise shots of the mittens. At this point you have the iconic stuff under your belt. If you want more, stay another day nd get a guide, if not you can be at the Grand Canyon or Lake Powell or Canyon de Chelly for lunch.
The drive between these places is also interesting, not like I40 crossing OK and TX.