When we were at the North Rim in 2011, we saw what we are pretty sure was a wolf on the entrance road. it was at least 100 yards away. i did get a picture, but it was so far away that it really does not show up. I could not tell what kind it was, but I remember I did not think it was a coyote.
I prefer down. Look at the quilts Tim makes at http://www.enlightenedequipment.com
They are top notch and light. Most of my hiking is in the Appalachians, but they would work great in the southwest too.
My wife & I spent a couple of nights on Horse Shoe Mesa two years ago. I thought the night sky was pretty awesome even though we had a nearly full moon in the sky for a good part of the night. My wife swears she saw a ghost on the mesa one night, but by the time she woke me up I didn't see anything....
You could also hike down the Grand View trail to Horseshoe Mesa and then go down beside the left arm and around and back up to the mesa via Page (Miner's) Spring. The trail down the left arm is fairly steep and mostly scree.There are fantastic views off the left arm of the mesa. If you do this hike ...
You're welcome. It did take me about 2 weekends and a couple of weeks of sewing every night to do it, but it's a great ultra light tent and roomy. The silnylon is extremely slippery and requires some patience to work with.
If you've got access to a sewing machine and have the time you can make your own "Bilgy" tarptent. I made one , 2 lbs and it sleeps two comfortably. I have not had a chance to try it in the SW. If you're interested go to http://www.questoutfitters.com.