Pont Alexandre III and Obélisque
Overflowing Seine, almost at bridge level in some places
Ice skating on the 1st floor of the Eiffel Tower
Oh yes, lots of snow meant that the Seine was a bit high :)
The trick is to go to La Conciergery next door and buy a combo ticket that lets you skip most of the Sainte Chapelle line.
the ludicrous line that doesn't move much