When a pnm asked me why I joined my GLO, I used to tell them that, allthough every GLO at my university is geat in its own way, this one made me feel right at home. Just by seeing the building, the active members and feeling the mood. The home-away-from-home thing really is the most important and it makes your story much more personal then telling all sorts of objective facts about your org. As a pnm I got a house tour at XYZ and the only things this girl told me were facts about her org, nothing about her feeling for it.
I also used to stress all the different opportunities the org has. There are tons of commitees you can join, so except partying and just attending functions someone else has organised, you can really DO something! (Hell, you can fill 25 hours a day with organizing, planning and doing other things for your org
!) Partying doesn't even begin to describe it!