Your advice on exploring & discovering Paris

Hello Paris Community,
What's come up in your mind when you have only half a day free? Your advice got through 'Paris Experiece' would be highly appreciated.
I have just become a kind of monthly commuter to Paris only since last month.
So, any idea about cultural stroll-around,creative foods, refined desserts or cozy places would also be of interest, if you could share 'Favorite Paris Classic & Branché'
Best Wishes, Kaylee