1. Hide Rich Snippets Markup.
The latest version (3.X) of the Rich Snippet Suite uses the latest JSON technique which is used as hidden data.
For earlier versions we highly discourage hiding the markup as your data is will not be crawled in the right way and the rich snippets will not appear. In general, Google will not display any content that is not visible to a human user. Hence, it is best not to hide the markup.