The Eiffel tower will be swamped with tourists and you could very well wait a couple of hours. For amazing views that INCLUDE the Eiffel tower go up to the top of the Tour Montparnasse. It's an office building about 2 miles from the Eiffel tower and it has a viewing platform on the roof. On the metro buy a 'Carnet' of 10 tickets for a large discount. The 3 or 4 day passes offer very poor value.


The views from the Sacre Cour and Montmatre are great.

If you like modern then head out to La Defense to see the amazing hollow cube office building.