A full day tour can combine two half day tours like in the following examples:

Paris + Half day tour
Fontainebleau + Vaux-le-Vicomte
Giverny + Auvers/Oise
Versailles + Trianons
Versailles + Chartres
Versailles + Giverny
Saint-Denis + Chantilly
Ecouen + Chantilly

Or consist for instance in a full day:

Versailles, the park, the city, Trianon and the Queen's hamlet.
Chantilly, the living horse museum, the Pheasant park and Senlis.

Our private service is "à la carte", so you can suggest your own ideas.