Airplane crash. Don't want to drown...

Would you rather be forced to stay awake for an entire week or tied up to a bed for two weeks?

tied up to a bed for two weeks (and i don't think i would leave it after the two weeks were up!)

Would you rather be in shark infested waters? Or be hunted by a tiger?

I know for a fact that most sharks are harmless.  So I choose sharks.

Would you rather have green skin or red skin?

Highly depends on the tone... I would say red. Would probably just look like a permanent sunburn and not like an alien.

Would you rather get lost in a desert (on a constant search for water and food) or in a hounted and creepy forest that has everything you need but also monsters that try to kill you every time they see you?

Haunted forest.  I'm scarier than any monster.

Would you rather sleep hanging from your ankles or eat a rotting fish?

Sleep hanging from the ankles.

Would you rather be trapped in a small cage for two days or in a luxus prison cell for two month?

This post has been deleted.

prison cell for two months.

Would you rather be a Thalmor? or Falmer?

Thalmor.

Would you rather stub your toe or your thumb?

Toe.  I need my thumbs.

Would you rather be called Ruvgein or Rivgrin?

Stay up late.  I don't think I'd be able to sleep while I still had things to do!

Would you rather own an indoor swimming pool or a cabin in the woods?

Indoor pool. I can use that year round.

Would you rather bite into an onion, or have nothing to drink but lemon juice for a day?

Onion.

Would you rather live somewhere with an average temperature of -20°C (-4°F) or 40°C (104°F)?

40° C!  I can't stand cold!

Would you rather eat chocolate pudding or cheese pizza for the rest of your life?