Hi Ash! I'm so jealous
Which part of France are you visiting? I went to Paris for my honeymoon, and had a really great time there, I so want to go back! A few things we did:
Packing: I don't know what kind of traveling you're doing, but get yourself a money belt and/or neck pouch. I put my passport and important documents in the neck pouch and keep it under my clothes at all times, so there's no chance of it being stolen or lost. I kept enough money for food etc for the day in the money belt, in small denominations. The rest of the cash can either go in your neck pouch where it won't be touched for the day, or locked in your luggage in the hotel (if your hotel seems trustworthy and not seedy, otherwise take the cash with you). Be careful with your bag and belongings in crowded areas, especially metro trains, apparently there are thieves and pickpockets everywhere.
Sightseeing: Palais du Versailles is not to be missed! Absolutely beautiful, and try to get around to the Queen's Hamlet. We didn't get the chance last time because there was a blizzard (well, not quite, it was snowing pretty heavily and we're not used to snow, so it might as well have been a blizzard, really
) so the Hamlet was closed. Views from the Sacre Coeur tower and Notre Dame tower are amazing, well worth the few Euro it costs for entry. I also loved walking around the Montmartre area. A tip for visiting galleries and museums and the like: buy advanced tickets (you can get a musee carte from train stations, for unlimited museum/gallery visits for 1, 3 or 5 days, can be a really good deal if it fits your schedule) and arrive as early as possible, so you have that pocket of time between the gallery opening and tour groups arriving. Because you know all hell breaks loose once the tour groups arrive
Oh and don't forget to visit Sephora on Champs Elysees (it won't be a makeup forum if I didn't mention that, now will it?)
Food not to be missed at any cost: crepes (try to go further out from touristy areas, I found the crepes near places like Notre Dame to be too limp and just bad), croissant, souffle, eclairs. If you're feeling adventurous and have some money to burn, try some good quality foie gras. I would recommend some escargot in butter as well, but I know some people get grossed out with those
That's all I can remember for now, hopefully that helps at all