If you book a table at the restaurant on the first level, you can beat the queue. We went up in the evening, had food, looked at all the lights and then went to the carousel by the river, followed by Batobus back to our hotel. Dd loved it. Jardin du Luxembourg fab for playgrounds etc Pompidou centre? Cite des sciences? Some trips on the river? Maybe the crypts if he likes gory stuff. The funicular up to the Sacre Coeur and a wander round Montmartre with all the portrait artists?
I should probably know this as I lived in Paris for 6 months but that was15 years ago and I was mostly drunk. Where are good places to go with kids in Paris. We will have 2 days in Paris before going to Disney.
Staying really close to the Eiffel Tower - which we will endure the horrendous queues to go up. Where else is good with an right year old boy.