Envision a mystical floating island adrift in a sea of clouds, where cascading waterfalls spill over the edges, disappearing into the mist below. On the island, a grand castle with spires reaching towards the heavens stands surrounded by lush gardens filled with vibrant, otherworldly flora. Dragons soar gracefully in the sky, their scales shimmering in the soft, ethereal light. A rainbow arches over the scene, adding an extra touch of magic. Capture this enchanting realm in a whimsical, fantasy art style, highlighting the surreal beauty and wonder of this airborne paradise.