We spent two nights at the El Tovar Hotel on the south rim of the canyon.
We arrived early afternoon and wandered around the immediate area as our room was not quite ready. We saw the condors swooping over the canyon - they were so close we could see their chest feathes.
I joined a Kodak Photographer at 6:30 am the next morning with a group of others, and he took us on a walk around the rim, explaining how and where to get the best shots of the sunrise.
We spent the day traveling the shuttle bus to all the different view points and in the evening gathered at Sunset Point to watch the sunset - there were hundreds of people there.
Before leaving on the second day we went to the corral to see the mules leaving for their trek down the canyon. The trail was so narrow it gave us palpitations just looking at it.
There are plenty of Ranger programs to occupy your time at the canyon such as photography trips, nature walks, and in the evening bonfires and talks on various subjects. Information can be obtained from Bright Angel Lodge.