All I can say is, go!
If you happen to make Paris a vacation, make sure you take a day and go to Versailles. It's about 20 or so miles west of the city, so it's about the same distance as DLP (which is east). The train ride out there is 30-40 minutes through quaint French towns. Suburbs of Paris, if you will.
Once at the train station, it's a good 10-15 minute walk to the gates of Versailles. Buy tour tickets, an enjoy.
I love history, so to be there was just awesome for me. The way the royals lived back then astounds me. But what impressed me most were the gardens. And I was there in November when nothing was blooming! I can't imagine them all flowered up!
The grounds of the palace are H-U-G-E. Lots of walking, but it's really fun to just go explore on your own. Make sure you end up at the "away house" (for lack of a better term). It's where the royals lived most of the time, as the palace was more for show.
There's a nice cafe in the palace that had really good food too. Then again, this is France.
If I ever make it back to Paris at a different time of year (i.e. springtime) I'm definitely going back to check out the gardens.
Anyway, if you have a bonus day, may I suggest Versailles? For the history of it, the sheer size of it, and for the beauty of it, it's totally worth it.