How to root but not root Samsung Galaxy Player 5.0
You can't do it....don't do it unless you want to get booted from the Screenwise panel and also be billed for the device (currently over $200 retail).

It's running a skin over the top of the device, similar to how Samsung runs their own TouchWiz interface over the top of Android OS. It's not just an app that's running on top (although there is a separate and completely different Screenwise app on the Android Market that is used with this panel, it's not the same thing).