Other links are available on web sites of Tourist Office of Houdan and Tourist Office of Dreux
For the visit of the Palace of Versailles, and even if you plan a one-day visit, we advise you take the "passport 2 days" (25 €) which has the great advantage of being cut-queue.
Below you will find the main sights and activities of the vicinity as well as some restaurants that we recimmend (not exhaustive)