One of the questions most often asked on the Venice Forum is how to get from the airport (or train station) to a hotel.
Firstly, go to your hotel's web site. Almost every hotel in Venice has its own website that provides accurate information on how to reach the hotel, often with a printable map showing the walking path needed to get there from the closest vaporetto (water bus) stop. If you're renting an apartment, you may need this streetmap with vaporetto stops marked. The current map of all the vaporetto routes is available online at the ACTV website. Do bear in mind that the "Internet culture" in Venetian hospitality circles can be far behind other countries' use of the Internet, so don't be surprised if you still find outdated references to a "n°82 vaporetto line" that since 2008 has been called the n°2 line, but the official hotel website is usually a good starting point.
From the Santa Lucia railway station (Ferrovia vaporetto stop) or the bus depot (Piazzale Roma vaporetto stop): Either walk or take a vaporetto to your hotel, for cheaper options. The most expensive option would be to take a private water taxi.
From Treviso airport: Take the ATVO bus from the airport to Piazzale Roma, then walk, or take the vaporetto or a private water taxi.
From Marco Polo airport: There are three possibilities. (1) Water taxi from the airport to as close as possible to your hotel, costing about €100. (2) Alilaguna ferry from the airport to a number of places in Venice (see www.alilaguna.it) for €15 per adult. (3) ATVO coach or ACTV bus from the airport to Piazzale Roma, then walk, or take the vaporetto or a water taxi.