My best one is arrive together, leave together. Go as a group and then at the end of the night leave together. If someone needs to leave (or be taken home) early, they should check out with someone so you always know where everyone is. If you just HAVE to go home with Joe Schmo, go to your room, change your clothes and wear something more discrete than your weekend party clothes, that way when you do they walk of shame (not that any sorority girl would
) you look a bit less trashy. If he doesn't want you after you change, well that gives you a good idea.
I think it is also important to listen to your friends/sisters when they tell you 'no'. Stomping off and doing who knows what in XYZ chapter room is not the answer. Some part of you needs the mechanism to, no matter how inebreiated, listen and trust your friends.
I'm all about the no drinks in the picture. Everyone has a back, put your hand behind your back at the very least.