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I think I have been 3 times and if I go back I won't be going in as there is so much to see around the city anyway. I will go for a walk though just to see the pyramid at night all lit up.

I think next time I go I just want to find a really nice place for lunch and relax. Since my kids had never been there we had to fit in a lot of tourist attractions in a single short trip - my fondest memories of Paris though have always been the out-of-the-way places and the long walks.