Wear Birkenstocks, sneakers, or your choice of can-wear-all-day-sans-blisters footwear. The pavements are hard and the queues are lengthy.
Take a whole day for the Musee d’Orsay and the Louvre. I did, and only saw about an eighth of the Louvre. But you can only do THAT MUCH museum, eh?
Try to find yourself two European art- history fanatics to be your guides through said- museums. They can sometimes be found at bars across from backpacker hostels (I’m just saying). If you don’t stumble upon any knowledgeable new friends, I would recommend those earphone gadgets that tell you about the artwork you’re viewing. For me, those stories bring art to life.