From there we took the Metro to Place de La Concorde, for yet more photo opportunities. My original plan had been to walk through the Jardin de Tuileries but Vito has some mobility problems, and time was getting on, so we took the Metro & RER trains back to Gare du Nord, in good time for the train (with dinner on board included in our fares).
As I've stated, that lot fitted fairly easily into the day at a leisurely pace. You could cram more in by, say, taking the RER train (instead of the boat) from Notre Dame to the Eiffel Tower, and by simply viewing the tower from its base, rather than ascending it.
If you fancy trying that tour (or modifying it to your own requirements), I'll happily provide further details about Metro/RER lines and stations, together with relevant links. Just mail me:
[email protected]
Chris
PS: One place NOT to go on a day trip is the Louvre. With 18 miles(!) of corridors, you'll only see part of it but you'll miss everything else in Paris.