This is such a great idea on how to avoid the extreme weather in Vegas. However it's not heavily promoted and I think, that the prices might be too high for families? It costs $5 per single ride, $12 for a day pass. I personally don't enjoy walking long distances in the heat, so this was a lot of fun hopping onto the rail. It's a lot like riding BART in San Francisco.
My minus 1 star is due to the extra cost in the connection to the Duece line, in order to get out to Old Town Vegas. Ouch! I had wished that it was part of the same system, however it cost us more money. Boo.
This is a super clean and fast way to get around. Try it once if you can.