I wish I'd been a better Big Sis--I hardly even know my Little, because we have different sets of friends!
I wish I'd joined my sorority sooner instead of waiting 'til sophomore year...what the heck was I waiting for?!?
And like everyone, I wish I'd gone to a fraternity formal!!!
I'm still in school so technically I *could* do these things, but I'm a senior so it's a little harder. And when you date GDI's, it kinda puts you out of the running to be invited to fraternity date parties, much less formals! (I've never been to either--just my sorority's parties and formals.)