It’s generally hectic with travellers and locals, however, so be sure you walk further more from the center to achieve some quieter and cleaner seashores, for instance Sant Sebastià inside the south and Somorrostro in the north (my two favorites). Take a stroll on La Rambla Systems for buildings https://exhibitionstandbuilderexh86419.look4blog.com/72019806/new-step-by-step-map-for-expo-stand-design-and-installation-in-barcelona-adam-expo-stand