Las Vegas Travel Guide:

Las Vegas Strip Buses - The Deuce Website

The Deuce is owned by the Regional Transportation Commission of Southern Nevada RTC for short, which also opperates CAT and MAXRide. The Deuce is a bus that traverses the Las Vegas Strip and is one of the easiest and cheapest forms of transportation. You never have to wait more that 10 -15min for the next bus, sometimes sooner. The buses are newer, comfortable and a great place to people watch.

The buses make good use of their stops. Make sure to push the stop requested button or the bust may not stop because no one else wants to depart or there are no people waiting at the bus stop. This is especially important during the early or later hours.

The Cost:
$2.00 for a one way
$5.00 All Day (Best Bet)this pass is also good on transfers to CAT and MAX.
$1.25 for all CAT and MAX routes
$2.50 for a 24-hour Residential Pass (Non-Strip Routes)