If you just want to go for the day,there are several bus lines that do casino runs down there from Vegas.You get a free lunch,a nice funbook, and the bus is FREE.Only drawback can be you might end up shuttling around Vegas for what seems like hours picking people up.
One time,I was picked up at 7:45 at Harrahs.Several stops later,at 8:20 we were at the Imperial Palace,twenty yards away.Then you go to a central depot and they put you on a different bus.
The ride,itself,is not bad. Pretty scenic and they show movies,as well.