Riviera Taxi

Here's a quote from an article by Rick Steves: "To tip the cabbie, round up. For a typical ride, round up about 5–10 percent (to pay a €4.50 fare, give €5; for a €28 fare, give €30). If the cabbie hauls your bags and zips you to the airport to help you catch your flight, you might want to toss in a little more. But if you feel like you're being driven in circles or otherwise ripped off, skip the tip."

Thanks Tim, very helpful!