I was there the 2nd week of Dec. in 2006. Some restaurants had some decorations but nothing major to where It would make an impact to where I would eat.
I do remember Mama Melrose to have decorations but like I said, it wasn't that great to where I would want to eat there just to see them.
Some places had some small christmas trees, garlands, etc.
Make your ADR's based on the food you like!