Craps is a fun game and generates a lot of noise in the casino. You'll always here yelling and screaming when someone makes a good roll.
However the game is little complex to learn, there's all sorts of strategy and many different ways to play. You could make $100s on a roll or loose everything. It's not as simple as putting a coin in a slot machine and pushing a button. In Craps, you need to know the game in order to win.
I created a simple reference guide on understanding the basics of Casino Craps. Use this to learn the basic of the game before you head to Las Vegas!