Answer:
I help boats park
I have four fingers and a thumb, but I'm not living. What am I?
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
I cannot be burned in fire or drowned in water
What is made of wood, but can't be sawed?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.