After literally years of hesitation, here is my first post, so be nice! :P
This is a picture I took with my 55-200 VR (on a D90) of some Mexican folk in San Miguel Allende. These guys where under a very big tree on a sunny day, and I was just shooting from afar. Unfortunately the guy in the background didn't have a sombrero, but well, tried cropping him and I'm not very satisfied. Probably the image is a bit too much on the reds, but oh well, it reminds me of San Miguel.
I'd agree it's too red... if you don't know how to change the white balance just open up a hue/saturation adjustment level (presuming you have photoshop) and click the drop down option that says "master", select "red" and then slide the saturation level a bit to the left.
Also I'd advise just upping the midtones a little with the levels tool as it's a tad under exposed.