Some people confuse vaporetti with water taxis, which are plush and comfortable but very expensive – about €30 for a journey in the centre. And far too many visitors still think that the gondola is the only way to travel on the water. (It would be if you fancy squandering €70-80 for an hour's ride and feeling a bit silly when other tourists gawp at you.) I had one gondolier badgering me and refusing to believe me when I said they were too expensive and that I had no intention of going in one. He then dropped his price to €60, which I'd rather spend on dinner, frankly.
Vaporetti, on the other hand, are big, functional and not very attractive, but they get you around the city and beyond in a scenic yet practical way. Some have an open section at the front, where you can get views of both sides of the canal. Others have the same in the rear. Then there's a central part that's under cover with seats and an open-sided covered bit. Once you've had a few journeys on these, you'll head inside for the comfort of a seat rather than be exposed to the elements. Having said that, my first view of Venice was from the open section in the middle, where even the relentless rain couldn't obliterate the beauty of the city.
Unless you're in Venice for only a few hours, it's definitely worth getting a transport pass which will give you unlimited journeys within a set period. As a single journey on a vaporetto costs €6.50, regardless of distance, this makes sense. Venice Connected is the city's transport site where you can book tickets in advance (and it's in English).
I had a 72-hour pass that cost me €28. It paid for itself in five journeys, two of which I had to take anyway to get to and from the bus station at Piazzale Roma to catch the Treviso airport bus. I ended up taking about 14 journeys in total, as it became much morefun to walk out to the further reaches of the city, such as Cannaregio, and then relax on a vaporetto for the journey back. It was so easy to pop over to the cemetery island of San Michele, or the church and bell tower on the island of San Giorgio Maggiore. Even the Lido was only 20 minutes from Piazza San Marco.
The final vaporetto journey back to the bus station was on a fine evening, when the sun was just beginning to set. The open section at the rear was empty, allowing us to enjoy the golden views in peace. Now that's the way to take your leave of this glorious city.