My 3 Tips: for Defcon, Blackhat, etc:
- If you dont drink a lot at home dont drink a lot in Vegas.
- If you dont work for a company dont wear their shirt (atleast in vegas).
- Go somewhere for a nice dinner and dont make a vendor pay for it.
Bonus Tip:
There are 30,000 people in Vegas who do what you do for a living. Make a friend… not everyone is trying to social engineer you.