If you are planning to visit the magnificent Château de Versailles during your stay in Paris I would truly recommend you to do it during its most exciting state, that is to say when the fountains are
During the weekends the lines can be long so I would advise buying your ticket online, 9,50€ (which is also the cheaper alternative than buying at the ticket office, 10,50€). The gardens open at 09h00 and I usually go there at that time in order to enjoy the gardens before the crowds are entering after their visit to the castle.
Before your visit, make sure to download the map over the garden which also includes the location of the different fountains and what time they will be sprouting water. This will make your visit easier and you will effortless be able to prepare your itinerary and make sure not to miss any fountain.
Château de Versailles – Place d’Armes, Versailles