Bus / Shuttles, Las Vegas
If you are staying at a Strip hotel the easiest way to get Downtown is by the CAT bus (CAT stands for Citizen's Area Transit). The service operates 24 hours every day on the Strip and Downtown and buses run every 15 minutes. It costs $2 and it is an adventure in itself. Try to get on the 302 which is the CAT express. It stops less frequently and is only the same fare.
Another way to save your feet to get around the casinos on the strip is by way of the Strip Trolley Bus. These run frequently as far as the Stratosphere from Mandalay Bay costing $1.50 per trip, stopping at most of the major casinos en route. Operating hours are from 9.30 am until 2.00 am every day and they run every 15 minutes. Exact fare is required, no change given.
There are a number of shutttrolley tours avaliable in Vegas... just check with the front desk at your hotel and they'll be glad to help.
An all day pass to ride the bus up and down the strip is only $5. I heard the new trolley/tram or people mover like we call it here in Detroit is free but it wasn't running when we were there.
The trolley makes the rounds along the Strip. The cost is $1.75 for one way ride, exact change required.