Right outside the San Marco Church, the Piazza San Marco offers beautiful views of the canals and a chance to take in local culture. Many vendors set up shop here, whether it be art, leather goods, souvenirs, or purses. Expect large crowds of both tourists and pidgeons during the day. Pickpockets have also been known to prey on tourists, so be careful with valuables.
The San Marco Church has a beautiful interior and offers the chance to view Venice from a balcony by climbing a few stairs. The church also has a section turned into a museum that displays Venetian history. While all of these things add to the Venice experience, be wary of the crowds again, as long lines take away from time spent at other Venetian spots.
