Now I know the Midi-Pyrenees region of France best so I will list a few of the incredible things in that region:
The second largest medieval city in the world that is still lived in today. I visit this fortress every time I come the France without fail.
The last stand of the Cathares took place here. It is quite a hike to get up to the actual castle (bring lots of water) but it is SO WORTH IT. I also visit here every chance I get.
Located in the city of Foix, this castle is incredibly beautiful. The town itself is also well worth visiting.
The city of TOULOUSE:
One of the very best cities in France. Many people say that it is a "large city with the heart of a small village." My father was raised here so I am a bit biased, but that doesn't change the fact that this city is incredible.
and now my favorite:
The PYRENEES MOUNTAINS:
These mountains take my breath away. That is all I can say.
The point of this rule is that you have to have fun. I'm in this region, so I have quite a bit of sightseeing at my fingertips thanks to the trains system in France. For those of you in other regions, find what there is to see. GO SEE IT ALL. You are in FRANCE! Take advantage of that fact!