It's a little difficult to describe Vegas. You just have to be there to soak it all in.
And I literally mean "cool". This "lake" actually generates a refreshing breeze every minute of the day. I don't remember my basic science in detail, but it's got something to do with the way the cold and hot air moves, right? ( I'm so ashamed, haha. :))
This is also home to the beautiful Bellagio Fountain, which gives a musical performance every 15-30 minutes. They play different pieces as often as possible to minimize the monotony.
You can have your pick of themes ranging from the generic 777 / Bar / cherry versions, to those featuring spaceships, marine creatures, Native American motifs ( I won my dough at one of those -- the free spins are key! ), unicorns, mermaids, card games, etc.