Paying for boat transport in Venice depends on whether you are using the public "Vaporetto" (water bus) or a private "Water Taxi." For the Vaporetto, which is run by ACTV, the most efficient method is using the AVM Venezia Official App to purchase and activate digital tickets on your smartphone. Alternatively, you can buy physical tickets at Venezia Unica kiosks, authorized tobacco shops (Tabacchi), or directly at major piers using contactless credit cards at the automated machines. For private water taxis, which are the "limousines" of the canals, you typically pay the driver directly via cash or credit card at the end of the trip, though it is highly recommended to agree on the fare beforehand or book through a reputable agency. If you are using a traditional Gondola, the prices are officially regulated by the city; you pay the Gondolier in cash (Euros) either before or after the ride. For a cheap crossing, the "Traghetto" (a shared gondola ferry) costs only 2 Euros for tourists, which you hand directly to the oarsman as you board the boat at specific crossing points.