The Paris Eiffel Tower is a must-do/must-see when you're in Las Vegas. I recommend going at night so that you can enjoy the beautiful city lights. My first impression when I walked into Paris Hotel wasn't a good one at all. There was no one around to point us in the right direction to purchase tickets to go up the Eiffel Tower. When we found an employee, she was rude. She responded "Back there." when I asked her where to get tickets and she walked away so I couldn't ask for details because it's a fairly large casino and "back there" could be anywhere. The next employee I found wasn't very helpful either, he said "I'm not sure if they're still open." Finally, we found the gift shop that sells tickets to go up the Eiffel Tower. The price goes up the later you go at night.
There's a photographer on the 2nd floor to take pictures of you with the nice Parisian backdrops. After a short photo shoot, we proceeded to the elevator and had to wait for a little while. The observation deck gets full so they can only let people up when others come down.
The view from the he top of the Eiffel tower is pretty awesome, especially at night when you can enjoy the beautiful city lights. You can see the Strip, the desert and residential areas. You can also catch the Fountains of Bellagio-it looks amazing from the top of the Eiffel Tower!