[font color=\'#000000\']I was just there in Feb. and loved it. I didn't do any sunrise/sunset shots, so can't comment on that. Just a couple of brief thoughts: (a) won't it still be god-awful hot there in Sept.? Be prepared-- when I was there in Feb., it was probably 80 degrees and there's very little shade int he park. ( Take some of the side trails. If you come in the park from the entrance nearest Vegas (can't remember if it's the north or south entrance, but it's the one that's furthest from Hoover), you'll see some pretty good stuff right on the main trail. Do some shooting there, but go down about another mile and there's a trail that goes off to the left. That's where I got my best shots, and it's away from other people. (Not that there were that many people there when I went anyway -- it was a lot less crowded than Red Rock Canyon Park). The one of the rock arch in the link below (the last pic) was in that location. BTW, to get that shot, I had to climb up to and then crouch down on the outcropping -- it's not at ground level.
Also, the road leading to the park (before you actually get into VOF Park) (again, driving from Vegas) has some nice shots as well. The the color wide angle landscape shot (the third pic) is from this location. I've also posted 2 other photos from various locations in the park.
Needless to say, I loved shooting there and hope to go back soon. I only had 2 days there and probably shot 300-500 images. It was totally quiet and otherwordly and really let me get into a photographic "zen".
Here's the link: http://www.photo.net/photodb/folder?folder_id=416146
(Sorry if they look low-quality or are too large or too small -- I don't have a lot of experience posting images on the web. But I have a 24x36 of the arch image (shot with a 1Ds) hanging on my wall that looks amazing).[/font]