Last semester I was enrolled in a bunch of philosophy courses, and one day toward the end of term, my Existentialism professor asks the class this very question. At the time my head was filled with all sorts of ridiculous nonsense (depressed, etc.), and I said I would do everything exactly the same, except to quietly arrange my affairs, and write some letters to my friends/relatives.
Of course, thinking about it now, this is dumb.
Now would be a bad time for this (Haw haw), since my friends are all spread out through the country, but I'd tell my closest (geographically) friends about it, and hope they'd forget about school for the second week. First week would be spent preparing and telling girls straight up that I like them. Also I would go home, not tell my family, but generally make them all feel loved.
Second week, we go to the Oregon Coast, camp (Using the rest of my savings), and generally have a rip-roaring time. Second to last day, get some LSD (Or shrooms if aid cannot be found), and spirit journey with friends. Last day, talk, be generally serious and awesome, and at sunset I jump off the biggest goddamn cliff I can find.
(Also: Dongs.)