Google penalty having bad sites maybe and working on 1 good site ?!!!

[sandyallain]

I have a list of websites that are not spam.. there are ok sites... just that I need to work on the conent again as the sites content might not be useful for users at 100%. There are not bad sites with spammy content... just that I want to rewrite some of the content to really make great websites...

the goal would be to have great content to get natual links and a great user experience.. I have 40 sites... all travel sites related to different destinations around the world. I also have other sites that I haven't worked on for some time..

here are some sites:

www.simplyparis.org
www.simplymadrid.org
www.simplyrome.org

etc...

Again there are not spam sites but not as useful as they coul become...

I want to work on few sites only to see how it goes....

will this penalise my sites that I am working on if I have other sites with average content or not as good ?

I want to make great content good for link bait