Key Points:
Venice is one of the best travel destinations in the world.
Earth Trekkers has provided a pretty good travel guide for Venice.
The primary things to do in Venice include: St. Mark’s Square, Doge’s Palace, and the Canals of Venice (1 day), Grand Canal and San Polo (1 day).
According to Wikipedia, "Venice is a city in northeastern Italy and the capital of the Veneto region. It is built on a group of 118 small islands that are separated by canals and linked by over 400 bridges. The islands are in the shallow Venetian Lagoon, an enclosed bay lying between the mouths of the Po and the Piave rivers (more exactly between the Brenta and the Sile). "
Here we quote the best way to travel in Venice provided by Earth Trekkers, a very good travel website created by an around-the-world traveler.
Check ChatGPT's answer for alternative itinerary.