The slot canyons in northern Arizona are favorites of nature and landscape photographers. The variety of light, colors and texture of the sandstone make for some unbelievable photographs. The most common shot from these places is a beam of light coming down through the canyon walls onto the floor. It's usually done by grabbing a handful of sand and throwing it into the air, the sunlight coming in then reflects from the airborne sand and, voila, you get rays of light. I would have tried that but it had rained recently so the sand on the floor of the canyon was too wet.
Rainfall and these canyons don't go together at all - it could rain miles away but the water eventually gets into the canyons and creates a rush of water and debris that is impossible to get away from. We saw evidence of just how high the water could get down inside the canyon - logs and other stuff was pushed into small crevices and onto ledges high above the floor. The guides and tour operators take care of worrying about these things for you but it's still good to pay attention.
Antelope Canyon is near Page, Arizona, not far from Lake Mead. If you get a chance to visit, take a tripod and make sure you tell the tour operator you are a photographer. You get a special pass that allows you to spend more time and go off on your own. If you are into photography it's worth the trip.