Paris - Eurostar with an overnight - itinery tips?

[practicallyperfectinmyway]

I'm planning a 2 day trip to Paris this oct 1/2 term, leaving early from st Pancras, will stay one night and back the evening of day 2.

Any tips on what to do to make the most of the days?

Merci beacoup!

What day of the week are you going and where are you staying? How old are your DC?
When you arrive at Gare du Nord, you can leave your suitcases and bags in the luggage lockers on the ground floor. The smaller locker costs 5,50 €, the medium 7,50€ and the large one costs 9,50 € (for 24 hours).