Senior year in high school v Senior year in college...
Senior year in high school was a drunken - smokin blur.
Senior year in college was a drunken brothel with orgies abound.  [AT MY PARENTS EXPENSE!!!!} 
Something about having to have to get a real job in a few weeks just make college girls ovulate. 
either way.. depending on your grades , depends on the fun you have.  
Senior year in high school - if you get into a college by November... YOUR SET!!! SCREW EVERYONE ELSE, tell your teachers off [ i've seen that happen, but it was by our valedictorian], and cut class.
Senior year in College - if your on course to graduate, and dont plan on persuing grad school go out, party and fornicate.  cuz jobs dont ask for your official transcripts - the only want to see that degree.... maybe.
In the words of Eminem...
 "if i could take it all back now - i wouldnt.
I woulda did more $HI*, that people said I shouldn't"
BTW - Socially, Freshmen year in college is going to resemble your Senior year in high school an awful lot.