Yes, Venice is one of the only major cities in the world that is truly and completely walkable, as there are no cars, trucks, or bicycles allowed in the historic center. Every part of the main island cluster can be reached on foot via an intricate web of roughly 400 bridges and thousands of narrow alleys called calli. You can walk from the Santa Lucia train station to St. Mark's Square in about 30 to 45 minutes, provided you don't get lost in the labyrinthine streets. However, "walkable" does not necessarily mean "easy." The city is physically demanding because of the constant need to climb up and over stepped bridges, which can be exhausting if you are carrying heavy luggage or have limited mobility. While you can walk everywhere, you will often want to use the Vaporetto (water bus) to traverse the Grand Canal or visit outlying islands like Murano and Burano. For your city data project, it is important to highlight that Venice is a pedestrian's paradise, but visitors should wear comfortable, supportive shoes and be prepared for a high daily step count, often exceeding 15,000 steps just by doing casual sightseeing around the various sestieri.