I'd save the world.

How in the hell would you manage that?

Then I guess I will drink as much as I can get my grubby hands on.

In Singapore.
Good luck with that one, mate. (joke, of course, I've gotten drunk more in Singapore than anywhere else)

Well, I for one would hijack an airplane and fly it, since I wanna die knowing that I actually fulfilled my dream, even though unsuccessfully.

Well if it ended then I'd be dead and wouldn't have much freedom of choice.

well being an alien i would laugh and when the world died out i would make armor games be transferd to my home olanets mind network system while makeing sure i translated it to my races language cause most of them cant speak any human language

We can tell that English isn't your first language.
In the case of a apocalypse, I would gather supplies and live in a bunker that I would build. I would kill myself if things got worse, and I would laugh at my family dying. *Sadistic*

Zombie apocalypse? Become Daryl Dixon, survive forever.

But if it's really ending, as in no hope of survival? Spend time with family and do things that we enjoy.

In Singapore.
Good luck with that one, mate. (joke, of course, I've gotten drunk more in Singapore than anywhere else)

Booooo....It's not as strict as people think it to be. Come to think of it, it isn't strict.

After some thinking, it would be good if OP clarified the state of the planet after the entire human species except moi got wiped out. Or are we supposed to imagine that?

That would depend on how the world ends.  Does the sun explode consuming the Earth?  Are aliens invading?  Is it zombies, and if so are they viral/bacterial zombies or supernatural zombies that climbed out of their own graves?  Is there a nuclear war?  Some of these are survivable and would mostly involve me leaving civilized areas and only entering towns and cities to gather supplies, just in different ways depending on what exactly caused the end of the world.  The sun exploding doesn't really give any hope for survival so there's no sense in trying.  If aliens invade we're screwed already so you can look forward to me hunting you down on their behalf (don't listen to movies, your old Lisa computer can't create a virus that will destroy alien space ships).

In the case of a apocalypse

Don't be foolish..it isn't the apocalypse that would happen...it will be the alpacalypse. My means of survival? Carl Wheezer.....'s cousin

i'd drop lots of acid so i could go out frying bawls

If the the world doesnt completely obliterate then bunker with  a garden and a solar generator and a well.