This is the Venice metro system and a good alternative to a pricey gondola ride. The tickets are expensive however, you can also be charged more for buying on the boat and carrying luggage. The single water bus fare is € 3,50 for one journey on the Venice network, The fare for a shuttle journey from one stop to the next one across the Grand Canal, or on the section between Lido and S. Elena, or S. Giorgio and S. Zaccaria, is € 1,80. Or try the "Grand Canal Ticket" € 5.00. This ticket is valid only for the Grand Canal route. It is valid for 90 minutes and more than 1 trip is allowed in this period.