It was so beautiful. We didn't take the cart to go up onto the Tower, but looking at it from down on the ground was amazing.
And every evening there's a "light show" where "the Eiffel Tower is adorned with its golden covering and sparkles for 5 minutes every hour on the hour, while its beacon shines over Paris." (from The Eiffle Tower official web site.)
A little video of the light show: