K, I'm not going to try and be the asshole that says "you shouldn't base your college off party ranking"... not to mention, how the fuck do they rank schools?  Amount of alcohol purchsed?  Or does one person go to every school and attend a random party?
I go to Michigan State.. we have some kickass parties, partly because our Greek system is relatively big and those parties can be fun.  Other wise we have huge block parties that are awesome too.
By the sounds of it, if you want a beach, and are smart, I recommend going to UCLA.  I had an incredible time visiting my friend and partying.  The people are super chill, the campus is beautiful, they party hard, and the academics are amazing if you can get in.
Or I'm sure any other California school would be fun.
From what I hear OSU has good parties and tons of concerts if you're into that scene.
Also, I believe, Ohio university was ranked #1 in playboy for parties.
I think if you just pick any major university, you're going to find good parties.