Yes, Giverny and Versailles are great day trips from Paris.

Re: Your recommendations for taking the tour w/ Paris Visions.

Yes, they have good tours. However, if you go to their website and look at the cancellation policy, you'll see that there is no refund for cancellations. Personally, that's a tough one for me as I prefer flexibility. For others who also prefer flexibilty, I'd like to mention that their office is right on the rue de Rivoli (near the Louvre) and you can walk in and book your day trip once you're in Paris, or you can probably have your hotel concierge call them and book it for you. I walked in the afternoon prior to wanting to go and booked it in their office.

Candice NYC