Those lists are all great and couple comments...
Based on my age many of the great things I experienced are no more. Granted, most of them involved alcohol but - Briarwood Bash, Phi Psi, Original Moving On, Sy Barash Regatta, drunken ordering stromboli from Vesuvios, and Ponies at the Skeller.
I'd disagree with those who talk about not getting hooked up early as my wife and I met at PSU and we both enjoyed PSU tremendously.
Somebody said about studying harder but I got couple degrees and that's all well and good but nobody cares about your GPA after your first job - which usually sucked anyway.
Basically, don't be dick, set some boundaries, have some fun and don't take yourself too seriously.