If I absolutely knew it was going to be my last day, I'd have to get some things checked off on my to-do-before-I-die list, or at least do some stuff crazy enough to sit back, laugh, and go "Okay, I can die happy now". I'd probably start by googling how to hotwire a car. I'd then drive my own to the rich part of the city and steal a Ferrari. I'd call the chick that always wants to bone me but I always turn down and pick her up. I'd have her naked and doing something to me while I drive around.

I'd rob someone at an ATM, because I'd need a phat wad of cash to do anything. I'd then phone a friend and have him get me a gun, since I'd need protection to make sure my day lasts to the fullest.

I'd want to die having sex and doing drugs in the back of a strip club. Or maybe having a threesome with a hooker and the gear shifter in the Ferrari.