Apple: Preserve a Mac’s Desired Configuration with Guest User Even After Reboot

The steps below allow you to preserve a Mac's desired configuration in Guest User account even after reboot:
1.  By accessing the Admin account, turn on the Guest User account.
2.  Log in to the Guest User account and do all the configuration.
3.  Without logging off the Guest User account, switch to the Admin account.
4.  Type in the following commands in the Terminal to unhide the hidden folders:

defaults write com.apple.Finder AppleShowAllFiles YES
killall Finder

5.  Go to Macintosh HD > Users > Guest and copy the Library folder in it
6.  Go to Macintosh HD > System > Library > User Template > English.lproj and replace the Library folder with the Library folder in Step 5.
7.  Delete the KeyChain folder in the Library folder.
8.  Done. Once you reboot the Mac and log in as Guest User, you will get all the configuration in Step 2.

Note:
You need to grant yourself the permission to access the folders above.

Please watch the following video for more information.
http://www.youtube.com/watch?v=JU-W2-_c5bA


Reference:
Permanently Modify Mac OS X Guest Account (Mac) Lion
http://www.youtube.com/watch?v=JU-W2-_c5bA