What is long and slim, works in light; has but one eye, and an awful bite?

What is better than the best thing and worse than the worst thing?

What do you get if you add 2 blackberries and 5 apples?

what has a neck but no head but has arms and stomach?

There are 3 doors On a stranded island. The first one with a weaponed serial killer. The second one with 100 crocodiles. And the 3rd one has a tiger that hasn't eaten in 4 years. Which one is the safest?