He'll be 8 and his birthday's not for a while yet, but I'm thinking (provided I can pay for part of it on AirMiles) that might not be a bad idea, especially as it will avoid me doing another kids party.
There would be 4 of us including DS2 (5). I haven't been to Paris since I was a child and the rest of us have never been. Main concern would be if there's lots of queuing, as DS2 is not good at that. What does climbing the Eiffel Tower involve?