How to grant access to Shared Documents on a page to members of the Visitors Group?

Hello Community

    Using Sharepoint 2010 Server and the UI you can grant access to a Site
via the "Visitors Group" but how will the members of the Visitors Group have
the ability to add and retrieve documents from the Shared Documents web part on
that web application page without the Ribbon popping up giving exposing exposing
other properties?

    Thank you
    Shabeaut