Beth, I know what you are saying, but this is my first Europe tour. Who knows if I will come again? I would rather do a whirlwind tour of everything I can take in and then later at home read about them and remember; than read about them later and know that if I had just crossed another bend, I could have seen it, and now I never will.
There's a choice between a compact and an SUV. I prefer the latter because I drive a Mitsubishi SUV at home and it can fit in another 2 people if someone's joining. If not, we will take a compact - at least parking and fuel economy are better.
I have 3 days in Paris, one day to check out the Eiffel Tower, another to check out the Champs Elysees area. The last day, just for random walk-around.
Next day, early morning, to Chaumont, 250kms away. I am guessing 3-4 hours, so by 10, I should be there. Spend the entire day around the lake. Small place, can be done in a day.
Early next day to Lucerne. Reach by 10 again. Find a nice , representative spot, and stay there for 3 entire nights. I don't need to see everything, just 1-2 nice places.
3 days later (and this is a tough day), go to Meriningen and Reichenbach of Sherlock Homes fame, reach Tisch and take the train to Zermatt for Matterhorn, stay 2 hours, return, and drive on to Chamonix at the foot of Mont Blanc and overnight. Matterhorn is a peak that looks exactly like a Himalayan peak called Shivling, which had half-climbed in college days, so there's an interest.
Next day, go to the Vercors area, stay in some small chalet south of Grenoble. 2 days and nights.
Repeat that at another small town in Provence, say Les Baux. 2 days and nights.
Come to Marseilles and return car.
2 nights in Marseilles, then fly to Rome.
5 days in Rome, 2 days in the Amalfi area, see Positano and Pompeii.
That's the plan as it is looking now. Total cost EURO3500, if we don't splurge on food and try to cook.