Last but not least from my long queue of places to write about... the fountains were one of the understated highlights of my December trip to Vegas.
It really is an entirely different experience in person. For one thing, you get to hear very well synced up music while surrounded by lots of people instead of just in front of your TV. For another thing, the water is astonishingly loud. To me, it's like the difference between watching fireworks on TV and watching them in person.
It also didn't hurt that I've been obsessed with the Vegas closing scene to Ocean's Eleven since 2001, so it was really gratifying to finally see it for myself.