Answer:
I am a ship that can be made to ride the greatest waves. I am not built by tool, but built by hearts and minds. What am I?
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
What two keys cannot open any door?
I am constantly overlooked by everyone but everyone has me. What am I?
What comes in many different sizes but is always only 1 foot long?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.