To avoid looking like a tourist in Lisbon, your first step is to ditch the bright "adventure" gear and high-performance hiking sandals. Lisboetas generally dress in a "smart-casual" European style; think well-fitted jeans, linen shirts, and leather sneakers or stylish boots. Because of the city's steep hills and slippery calçada portuguesa (cobblestone), residents prioritize footwear with good grip, but they choose aesthetic options over chunky gym shoes. When dining, avoid the restaurants with "picture menus" on the street in Baixa; instead, look for small tascas where the menu is handwritten or only in Portuguese. Timing is also key: locals eat lunch around 1:00 PM and dinner no earlier than 8:00 PM or 9:00 PM; showing up for dinner at 6:30 PM is a dead giveaway that you are a tourist. Additionally, try to learn a few basic Portuguese phrases—starting a conversation in Spanish is often considered a slight faux pas. Finally, don't stand in the middle of the sidewalk to take photos of the famous Tram 28; instead, treat it like the public transit it is, and move with the purposeful pace of someone who has a destination in mind.