We arrived at Versailles at 11am. It's an easy 40 minute train ride from Paris. The Chateau and grounds are fabulous and well worth a visit.. We were there during the third week of June, and the lines were quite long to get into the chateau. My husband and I had the Paris Museum pass, so the ticket person suggested we view the gardens and Grand Trianon and Petit Trianon first, then return to the chateau in the afternoon when the lines would be shorter. It was the perfect thing to do! The Paris Museum pass covered all that we did at Versailles.Definitely use the audio guide because it's just too much to try to take in and understand without it. Our two daughters, ages 14 and 11, really enjoyed seeing all of it and there was no charge for them. Plan to spend a good portion of the day at Versailles if you want to tour the chateau and see the grounds, too.
I will add that we also took a day trip to Fountainbleu to see the chateau there, and liked it just as much as Versailles. It's an easy 40 minute trip out of Paris. The chateau is fascinating and has lots of history, and the audio tour took about two hours. An added bonus is that there were no crowds at all; we walked right in! Fountainbleu is a lovely little town to explore, too.More