Don't believe all the people who are being babies.
You WILL have fun.
There WILL be parties.
People DO get fired, on occasion, but for good reasons.
Anyone who pretends ridiculous amounts of partying DOESN'T go on is lying.
You just have to manage what you do. I am not the "partying" type, so when I was there, I didn't ever partake in the drunken-ness that is typical of many CP employees.
You work, but you also have fun. Just keep the balance. : )