I've posted here rather than in the Post Processing forum, because I think people here will get the most use out of it. (please move if you would rather have in the PP forum mods).
A year or two ago, I read an article about using LAB to increase colour saturation on an image, and somehow extracted the information from another site/action to make an action that will increase the saturation in an image, but leave the skin tones mostly unaffected. It's fully automated so no user intervention is required, and you can use it to batch process images. I used it all the time, and thought I would share.
Protect Skin Saturation Action
The action includes one that leaves skin untouched,and one that saturates everything. Enjoy, and please leave feedback and/or before and afters.