Attitude
If you gamble, chances are you'll lose. No ifs, ands, or buts. You must understand and accept that fact. How do you think the Vegas casinos paid for all their fancy stuff? Of course! By taking money from all the millions of losers who flock to Vegas
each year. You must treat craps as just another form of entertainment. Instead of paying $200 for a nice dinner and show, you pay $200 for a few hours of fun and excitement at the craps table. If you get lucky and walk away with some of your $200 still in your pocket, then that's icing on the cake.
You must never walk up to a craps table expecting to win. You can be positive, have discipline, play smart, and hope to win, but you must not expect to win. No matter how hard you hope, you must always keep in the back of mind that the game is designed for you to lose. Don't take it so seriously that it's no longer fun. If you happen to walk away having won a few bucks, then your vacation was that much sweeter.
I don't believe in all the psycho-babble mumbo-jumbo about how positive expectations can affect the outcome of your play. None of that mojo is going to make the dice land any differently than how they want to land. Yes, it's important to maintain discipline, play smart, and be positive, but you must remain in reality. Reality is that the game is designed to beat you, no matter how hard you wish or expect to win. Any mind meld that you hope to make with the dice through positive mojo isn't going to help. The reason for maintaining a positive attitude isn't to affect the outcome of your play; it's to help ensure you have fun.
Have discipline, play smart, and most importantly have fun. Otherwise, you'll ruin your vacation by getting mad because you couldn't beat a game that you were never supposed to beat.