When in Vegas....Avoid the taxis.

Whatever you do, don't take a cab if you can help it.

Las Vegas Cabs are Massively Overcharging Riders. US News And World Report

Las Vegas-area cabs are overcharging customers to the tune of $47 million a year, according to an audit released Tuesday of the Nevada Taxicab Authority, which regulates the rides in Clark County.
Auditors for the governor's finance office blamed a $3 credit card processing fee that they say is much higher than in other cities and probably shouldn't exist. They also criticized a decision to increase a fuel surcharge even as gas prices are tanking, saying having the surcharge at all is unique among the 12 major Western cities that the taxi board tracks.

For years now I've made it a practice to ignore Las Vegas taxi cabs at all costs, even buying an umbrella and walking in the rain when absolutely necessary.  When I arrive at the airport I use a hired car. Not only do they pick me up in baggage claim but, since you have them for around an hour, they'll stop by a store to let you pick up water etc. for your stay.

Getting around town I either use the bus, or just walk. You can get a 3-day transit pass in Las Vegas for $20/person. The Deuce route alone will take you pretty much everywhere you need to go.

If you do need to take a taxi then Google Map the shortest route to where you're wanting to go in advance, and ensure that the taxi driver understands very clearly where it is you are going. Pay cash whenever possible (don't pay that credit card fee). 

If you have to take a taxi from the airport it is NOT OK if they ask you to take the Freeway. You're being long-hauled which will cost you $10-$20 more.

Also of interest, was this:

Auditors were so critical of the Nevada Taxicab Authority that they recommended abolishing it and turning over its duties to another agency.
Ron Grogan, chief of the authority, said the taxi board would have to discuss the recommendations before making changes. But he acknowledged that his agency had probably outlasted its usefulness and struggled amid complex regulations.

You almost never hear a bureaucrat admit that their agency is a drain on taxpayers and worthless. Credit to Mr. Grogan for admitting the incompetence that his organization is exhibiting.