Riddonkulous

I spin in endless circles under colorful lights and cheerful tunes that fill the air with joy. Children climb aboard my painted horses lions camels and chariots that rise and fall like waves in a gentle sea. I turn without ever moving forward trapped in a ring of laughter and dreams where time pauses for a magical ride. At fairs and parks I wait for the next group to hop on and chase the brass ring that promises another go. What am I?