Most tourists who have at least three days to explore the city recommend creating their own walking routes in Venice.
Standard routes mostly involve visiting the main sights of the city in a specific sequence, for example: Santa Maria della Salute Cathedral - Ca' Pesaro Palace - Rialto Market - Santa Maria Formosa Church - St. Mark's Square and Cathedral - Doge's Palace.
Such a tourist route in Venice has two downsides: firstly, you risk being in a huge crowd of tourists, which means queues and the inability to calmly enjoy the surroundings and take photos; secondly, you won't be able to observe the bustling daily life of the city.
Therefore, take a map in your hands, mark the places you would like to visit, and organize your own walking routes in Venice. The historic part of the city is quite small, so walking routes in Venice will be even more interesting if you stop somewhere along the way to have a snack on the terrace of a cozy café, sit by the waterfront, and wander through the winding narrow streets.