First and foremost: Make sure to bring plenty of spare cash, I was amazed at how fast mine seemed to evaporate.

I've been to Paris and Munich, although I didn't really spend enough time in Munich to comment much on it. Paris, on the otherhand, I stayed three nights there.

First, I would heavily advise the Eiffel Tower. It'll be busy, but its worth it. The view from the top viewing area is great, it seems as though Paris stretches on forever from to the horizon. Also, if you go by at night, you may get treated to the lights that adorn the tower shining like a great light show. I personally liked the bateax mouches ride on the Seine.

I must caution you, however, to be very careful with your money. In my experience, the Parisian pickpockets were rather skilled. Also, watch for gypsies and con artists who are looking for tourists like you. They will congregate at the tourist attractions, like the tower, Notre Dame, and outside the Louvre. Speaking of the Louvre, it is well worth admission to get into, unless you absolutely detest art of all kinds.

Lastly, if you're looking for some quality(and relatively cheap) french quisine, I would try to save some cash whenever possible. Personally, I found some of the food and beverage stands on the Champs Elysees were of great value. I got an excellent chocolate crepe from a stand for a meager one euro, as opposed to the four to eight you might pay at most of the shops and restaurants. And if you're looking for souvenirs, some of the paintings for sale along the Seine were pretty good as well.