Arrive at Palace of Versailles for your timed entry, ideally around 9:00–9:30, when the State Apartments, Hall of Mirrors, and Royal Chapel are still relatively manageable. From Paris, RER C to Versailles Château–Rive Gauche takes roughly 35–45 minutes, followed by a 10-minute walk; buy a ticket that covers the full journey, since ordinary Paris Metro tickets are not valid to Versailles. Allow extra time for security—queues can easily add 30–45 minutes in August—and expect about three hours inside. A passport or museum pass may reduce the ticket cost; otherwise palace admission varies by ticket and musical-fountain programming, commonly around €21–€32.
Walk through the gardens toward La Flottille beside the Grand Canal for an easy French lunch, usually €25–€40 per person. It is a practical stop rather than a place to linger over a long meal, so reserve if possible or arrive before the main lunch rush. Afterward, spend around two hours exploring the Gardens of Versailles: follow the formal parterres and Grand Perspective first, then check the fountain schedule, which can involve an additional ticket on show days. The grounds are extensive, so comfortable shoes are essential; bicycles and the little train save time, though walking gives you the best feel for the layout.
Continue to Grand Trianon, about 25–35 minutes from the palace area on foot or a shorter ride on the little train, and allow an hour for its elegant pink-marble rooms and surrounding gardens. Then make your way to Petit Trianon and the Queen’s Hamlet, allowing 1½–2 hours; this is the quietest and most atmospheric part of the estate, with shaded paths and small lakes, but it is also where visitors underestimate distances. Keep your estate ticket handy, and plan to leave the grounds before closing—hours vary seasonally, but the Trianon estate generally closes earlier than the gardens.
Return toward town and finish at Place du Marché Notre-Dame, roughly a 20–30-minute walk from the palace or a short local bus ride. Browse the covered market halls and surrounding streets, then stop for a pastry or an aperitif at one of the cafés around the square. It is a good place to decompress after the palace crowds; market activity is liveliest earlier in the day, while cafés remain pleasant into the evening. If returning to Paris, walk back to Versailles Château–Rive Gauche for the RER C, allowing about an hour door to door and checking the last convenient trains before settling in for your drink.