Ramboulliet is an easy day trip from Paris. The surrounding gardens were nice (will probably be even better in the spring/summer when everything is in bloom). You can only tour the chateau during set times. We got there at 2:15, but couldn't tour the chateau until 3pm (plan accordingly. and maybe try to buy the tickets on line if possible). Groups go through the chateau with a "guide". It is not really a guided tour. I think they are just their to make sure people don't linger to long, but the "guide" does give a few bits of information in each room. I felt a bit rushed through the chateau. Not sure if the thirty minutes you get touring is worth the 8.50 euros so try to go on the first Sunday of the month.