By looking like a tourist going on a hike. Leave your shorts and sneakers at home. You do not have to look like the Parisians as they naturally have style and are so chic. But at least make an effort like this local Parisian to wear dress pants, nice coat and sensible shoes.
One of the things I enjoyed was riding the local Bus around Paris. I discovered so many areas around Paris that I would not see from a local Tour Group. It is also safer than the underground Metro and offers the best views of the City.
When you ride the Bus or walk around Paris, you will discover that you will see the Eiffel Tower in so many spots around the City.
Although the best croissants in the World for me is in Paris, try the Pain raisin, the macarons, Pain almond and also their local quiche.
Best advise from this article is to try to understand and to imitate the local customs and you'll be rewarded for your efforts. Try to speak some french phrases and great them with a friendly Bonjour and then Au revoir which will do wonders for you during your visit to Paris.
Bon Weekend mes amis!