As others have said, just be subtle.
Who knows, you might be rushed by a girl who is VERY conservative & would take "I like to party!" differently.
Every chapter has a few girls who are more religious than the others, so you don't want to offend them. Just be polite & see how the conversation flows, but don't lose control of yourself. It's easy to say too much.
just remember, sororities are NOT about partying. It's about sisterhood, philanthropy & improving the world. Sure, there's an amount of socializing involved, but really...those of us who have lived it can see that partying is just a small part of it - and actually, gets to be more of a drag when you're a senior ready to graduate!
