Your tail is almost a third arm and hand for you.  As a bonus action, you may perform one of the following actions with your tail.

• Draw or stow an object weighing up to 1 pound with your tail. If doing this while stealing, you gain advantage on your Sleight of Hand check.
• Open and close doors.
• Use thieves tools.
• Wield a dagger and make a single attack with a -4 Hit modifier. 
• Gain advantage on Grapple checks.
• Give the Help action to a friendly creature within 5 feat.
• Hang from a piece of scenery.