We're flying into Paris on the morning of Sept. 15 and flying out of Berlin the morning of Oct. 1st. Right now our plan is do Paris -> Ghent -> Amsterdam -> Berlin.
It's occurred to me that instead of considering this set in stone, I should leverage the collective knowledge of all the travelers on this forum to see if anyone has other itineraries. The thought had crossed my mind to go through Alsace/Loraine. Perhaps knock off Ghent. The train ride from Strasbourg to Amsterdam looks pretty long though. Obviously the goal is to minimize travel time, unless it's enjoyable/scenic travel time. I'm not opposed to renting a car in France, but of course I know it's a pain taking it out of France.
I'm a culture junkie and general europhile (or western civophile). My girlfriend is more down to earth and likes drinking and eating well, hanging out and walking around cool places. She could spend a day thrift store (or market) shopping, to give you some idea.
Anyway, if anyone has some alternative ideas they would like to run by me I'm totally open.