Food bloggers David Lebovitz (a cookbook author and former pastry chef from California) and http://chocolateandzucchini.com/ (young French food writer who honed her English in Silicon Valley -- scroll down lefthand sidebar for Paris City Guide in archives) have recommendations on where to eat and how to navigate the Paris restaurant culture (hint: reservations are almost always recommended).

Meeting the French might have a tour you can take while you're there. I enjoyed the Gerard Mulot chocolate/pastry tour, but there are other events.

As for walks, I recently enjoyed a long ramble through the 9th and 10th arrond. -- grand 19th c. Haussman Paris meets ethnic diversity.

My favorite view remains the one from the steps of Sacre Coeur. Also OF the Sacre Coeur.

Can't help you with nightlife but the above websites might. The Latin Quarter is traditionally full of youthful energy but I think the 18th-19th-20th arrondissements are the happening neighborhoods right now.

Second the suggestion to find your neighborhood cafe. You're staying in a less touristy neighborhood so the locals might be a bit friendlier to an outsider -- you'll certainly be more noticeable than in the center of town.