Answer:
I'm many people's favorite place, even though many don't remember their stay. You'll love to come but hate to leave. If you get cold, use my sleeve. What am I?
I am wood that is neither hard straight or crooked
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
Bury deep, Pile on stones, My mind will always Dig up them bones