Facebook Places - how to update your privacy settings, again.

How to Disable Facebook Places
Summary of what to do:

• Privacy Settings, Customize, Things I Share
• Change Places I check in to only your friends or Only Me.
• Include me in People Here Now after I check in - Uncheck enable.
• Go to the section Things Others Share and find Friends can check me in to Places - set as Disabled.
• Click the Applications and Websites link, go to Info accessible through your friends, Edit Settings.
• Uncheck everything and Save.

Read the above link for more details and explanations.