Excellent list here:
4. Develop the art of sitting and watching.
In her book, Helgoe talks about the French term “flâneur” (feminine, “flâneuse”). It translates literally to “idler or loafer,” but the poet Charles Baudelaire defined it as a passionate observer. Yes, yes! I am a flâneuse. I love just sitting and watching people doing what they do, and even more so when I travel. I do it in parks, I do it in museums, I’m finally able to do it in restaurants. That ability took a while to develop but I can now just sit alone in a restaurant and eat and watch people around me, rather than immediately burrowing into a book. Mind you, I always have a book nearby during my sitting and watching, just in case I need to escape the world for a bit or in case I suffer a bout of self-consciousness, but it often remains unopened while I watch and eavesdrop.