Answer:
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
In spring, I am gay in handsome array. In summer, more clothing I wear. When colder it grows, I fling off my clothes. In winter, quite naked appear. What am I?
I have roots nobody sees. I am taller than trees. Up up I go but I never grow.
What do you get when you cross a pig with a karate expert?
I fly forever Rest never.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.