Travel in Venice is primarily done by foot or by boat. The water buses or "Vaporettos" are a cost-effective mode of transportation and can take you to various destinations in the city. A single ride on a Vaporetto costs €7.50, or you can purchase a 24-hour pass for €20 or a 48-hour pass for €30.
If you have additional time, consider visiting the islands of Murano and Burano for their famous glassware and lace industries respectively. If you have less time, it's recommended to skip the Rialto Market and focus on the other attractions mentioned.