February 29th only comes round every four years, so go do something fun and memorable!
Have cupcakes for breakfast or ice-cream for dinner.
Visit a museum or art gallery even though it's a workday.
Read a book from a genre you normally wouldn't touch, or an indie comic, or some Victorian poetry.
Call an old friend out of the blue.
Try a new sport, or an old one. (I'm thinking medieval sword fighting.)
Write a drabble,
do a cartwheel,
sing karaoke like nobody's listening.
Take a leap!