Answer:
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
We are few to the wise; We are abundant to the drunken; We can calm the beast and are precious to the child; We can devour the heart, without piercing the skin
What measures out time. Until in time all is smashed to it?
What kind of room has no windows or doors?
In Paris but not in France, the thinnest of its siblings.
People take me on walks and I run and have fun. What am I?