Florianopolis' Municipal Market is the city's most atmospheric everyday landmark, a long arcaded market building where fishmongers, produce stalls, lunch counters, and beer tables share the same downtown rhythm. It is a practical market first and a tourist stop second, which is why it works.
Come around lunchtime if you want the place at its liveliest. The market is a good introduction to island seafood and local social life, and it pairs naturally with a walk through the central squares before heading back toward the beaches.