Venice taxis come in two varieties: water taxis (which are convenient but expensive) and land taxis, the subject of this article.
Land taxis are of limited utility in Venice, because most of the city is off limits to automobiles. The Piazzale Roma is as close as a four-wheeled taxi can get to Venice's historic center. From there, you'll need to reach your hotel, hostel, apartment, etc. on foot or by vaporetto (water bus).
Still, a land taxi can be convenient if:
Where to find a taxi
Venice taxi fares
Plan on spending up to 50 euros for a taxi between Marco Polo Airport and either the Piazzale Roma or the cruise terminal. (A taxi to a hotel in Mestre or Marghera could be slightly cheaper, depending on the hotel's location.)
Add-ons for luggage, late-night trips, and travel on public holidays could push the fare higher, so ask the driver for an estimate if you're watching your euros.
Tipping is optional, but it never hurts to round up the fare or tip 5 to 10 per cent, depending on whether the driver has been helpful, the tipping customs in your country, and your own comfort level. (Americans tend to tip generously; Australians frequently don't tip at all.)
Final note: If you're arriving at the Venice Santa Lucia Railroad Station, you won't be able to get a land taxi. However, you can turn right as you leave the station and reach the taxi stand in the Piazzale Roma by walking across the new Ponte di Calatrava (officially "Ponte della Costituzione") bridge, which has a gentle incline and is fairly easy to cross with rolling suitcases.