What MMO would you bring to the proverbial desert island?

So let's pretend you're stuck on a desert island. You're stocked up on snacks and sunblock. You've got a gaming rig and internet but no conceivable way of contacting anyone to come save you (work with me here). And let's pretend you managed to bring just one single MMO with you to this magical island that lets you play MMOs but not communicate the fact that you're stuck on, you know, a desert island.

Would you hedge your bets and go for a sandbox with a boundless amount of content? Would you pick something you've never played to minimize the been-there-done-that factor? Would you pick a classic themepark and set yourself to grinding up a thousand alts? You only get one, so choose carefully: What single MMO would you want handy if you were stranded on a desert island?

TH