You'd take jeans? lol :P

I'd have to say a satellite phone Then a knife and flint & steel.

But as far as fun stuff goes:

+My ipod once I had put all my music on it (although it would be pretty useless without a source of eckeltricity, but lets suspend disbelief here)
+The whole Harry Potter collection
+An interesting, resourceful friend (I'm not sure who. Sorry to drag you on this deserted island with me, but I'm quite the extrovert and I need good company )