Versailles: try to time your visit to catch musical fountain displays & equestrian shows.
Guided tour available also (link)

How much time? taken from tripadvisor:

• Plan on 2-3 hrs for the château, 1 hr for the gardens, and another 2 hs if you want to include the Domaine de Marie-Antoinette in your visit. Add 2 hours to cover your round-trip transit time, and it’s a five- to ten-hour day trip from Paris.
• 🚂 RER C suburban train runs along Paris’ left bank and finishes at Versailles Rive Gauche- it’s the last stop nearest palace. www.ratp.fr/plan-interactif  On your way back to the city get off at Champ de Mars/Tour Eiffel stop and visit Eiffel Tower. Then you can take evening river cruise that starts nearby at the foot of the tower.

notable especially for the ceremonial Hall of Mirrors, the jewel-like Royal Opera, and the royal apartments; for the more intimate royal residences, the Grand Trianon and Petit Trianon located within the park; the small rustic Hameau (Hamlet) created for Marie Antoinette; and the vast Gardens of Versailles with fountains, canals, and geometric flower beds and groves

⚠️Closed on Mondays

• The Palace 9a-530p
• The Estate of Trianon 12p-530p
• The Gardens 8a-6p
• The Royal Stables 12:30p-5:30p
• Free app w/ audioguide tour & map: itunes

The Paris Museum Pass grants admission to the Palace of Versailles, the palaces of Trianon and more than 60 museums and monuments in Paris and the Paris region.
It does not grant admission to the Gardens on Musical Fountains show and Musical Gardens.

“To escape all his bicep-flexing grandeur visit the park to see Marie-Antoinette’s fairy-tale farm.” the small rustic Hameau (Hamlet)?