We often stop by Palo Duro in the fall (September) when we bring our rig home to Houston from Colorado.
We like the Mesquite camp area - sites 88-92 are all good. The Mesquite campsite is at the far end of the park - it'll take you 20 minutes to get from the entrance to that location. Here's the map (http://www.tpwd.state.tx.us/publicat...p4506_007g.pdf
Attached is a picture of our rig at campsite 88 (I think) in September 2006 - we only stayed overnight (click on it to enlarge). Note the large mound to the left of the photo. With sunset approaching, we took our zipdee chairs and a bottle of wine and climbed up to the top of the mound to watch the sunset.
As the line of the sun passed the top ridge of the canyon, all the coyotes around the edge of the canyon started yipping and howling. This went on for about 60 seconds, then stopped suddenly. My wife says "OK, time to go in NOW!" But I convinced her to stay and enjoy the beautiful remnants of the sunset and the bottle of wine.
Before too long, the bottle was gone (ooops!) and so was the daylight. All we could see of our Airstream was the exterior lights next to the door.
Suddenly, maybe 20 feet away in at the base of the mound - too dark to see anything - we hear this low rumbling growl.
In about 1.2 seconds, I was standing in the doorway yelling "hurry, honey, I'll hold the door open for you!"
The next morning, we had to leave early and climbed back up on the mound to have our coffeee and watch the sunrise. Just as the rays of light hit the top of the opposite side of the canyon, all the coyotes started howling again! I think they were saying "look, those two fools didn't learn anything last night!"
Anyway, we've been back a few times, but have always avoided the heat of mid-summer.
We noticed that in September there are little gnats that can get through the screens of the door and window. They will congregate all around the lights - they really seemed to like landing on the white vinyl headliner. Fortunately, WINDEX killes them very effectively, and we also had an impromptu cleaning of our ceiling!