That's an interesting question and I admit that it is very very difficult for me to say something on this topic.

I'd freak out. Most likely. xD" If I knew that this was my last day, I'd definitely cry, because I really don't want to die that early. I don't think I could enjoy the day. I'd try, but I'd end up crying all the time because I'd know that this was the last time for me doing this...

So I try to think about something...
- First things first. I'd visit my dear brother. He's the most important person in my life, so I HAVE TO see him before I go. .-. He probably would be the person to calm me down. xD" I don't know what I'd do when I meet him, but I suppose we'd be talking for hours...
- Go out with friends. I really enjoy going out with friends, so I have to do that one more time. But I doubt that I'd have fun. That would be one of the things that would make me cry. xD"
- Perhaps I'd even talk to my father to finally remove all the arguments we had. I've got a few problems with him, and when I'm emotional I tend to make up with people and forgive them for all that they've done. I'm quite sure I'd do this. O.o"

There wouldn't be more... and all the things I listed would take a few hours. xD" So the day would be over very soon .,.
I really dislike the thought of having to list things I'd do on my last day here. xD" That really makes me sad...