You may want to sneak a bit of color film as well for a couple of sweat
photos.

Gary

Point Imperial is excellent early, pre-dawn until shortly after sunrise,
especially if there is a high wind to kick up dust in the atmosphere for a pink
sunrise.  A split-ND is handy here at times.

Cape Royal is excellent late in the day, and also early but I'd do Imperial if
I only had one AM.  Lots of angles to shoot from at CR.  Don't underestimate
the drive time out and back if making dinner reservations (the lodge is
excellent for meals), it's a slow road to drive on, especially if you wait for
sunset light.

If the dirt roads are open you might ask the Rangers about Point Sublime, which
is a fairly long drive to an isolated spot with really nice panoramic views,
especially good late.

Hiking down the Kaibab Trail for an hour or so will give you some unique
vistas, recommended if you are a sturdy hiker.

Unfortunately the lodge is on a side-canyon so several miles from the main
channel of the Colorado River, that's why you have to drive a bit to reach some
of the better spots.

If I only had two days I'd definitely hit Cape Royal late and Point Imperial at
sunrise as must-do's, and maybe try something different like a hike or Sublime
the other day if those two spots didn't catch your fancy.

Have a good trip!

Bill in AZ