I have one warning for the author tho. Frats are societies and as such they are regulated by a hierarchy. Don't ever forget it. You don't need to be a leader right away, but you certainly want to avoid the bottom of the ladder. There is - always - at least one goofy in every group.
I want to be social and party and so on.
You probably just want a shortcut to girls. I'd say go for it, experience things by yourself. But remember that your adhesion to a frat (or anything else for that matter) won't do everything for you. Status is determined by the way other members treat you.
By the way, "being good with crowds", "dancing", etc: it's a smoke screen. Don't focus on that. All you need is to be liked by the leaders (aspire to become one).
The first mistake you can make is trying to please them by doing everything they ask. You'll see the majority of people will try to please them this way. Avoid this trap.
Use your smartness and some boldness. Be active, make it your own experience, don't be passive and wait to be fed. If you are active and bring something with your personnality and energy, it'll be hard not to like you. Be around the right guys. A couple of social psychology books might be useful as well. It's a good challenge.