Good luck, hon! My big grew up down the street from the sorority houses in Iowa City. She used to sell them Girl Scout Cookies.
I'm glad the RC's told you about which conversation topics to avoid. We have the 5 Bs: Boys, Booze, Bashes (includes both parties and bashing other people/groups), Bible, Bank. Also avoid heavy political issues, though if you're politically aware and active (like I am), you can safely mention that. Just don't engage in debate.
I'm sure you'll do fine. You sound like you've got the right mindset. Bet you know which house I'm pulling for.