My family did all of our Christmas celebrating on Christmas Eve. We opened presents after midnight and some of us ended up singing karaoke until 5am. So for Christmas Day, we pretty much did nothing Christmas-y. For most of the night, I even forgot it was still Christmas.
We did classy things like drink some wine at the Mandarin Bar (above) and The Chandelier (below). The latter is a multi-level bar/lounge in The Cosmopolitan that is dressed up to look like, you guessed it, a chandelier. We also did less classy things like randomly find a free open bar at The Rockhouse and eat $2 foot-long hot dogs at Casino Royale. Good times.