First, carefully listen to the original work for piano and perform this piece with attention to the light sounding sentiment of the composer. Think of soft and clear articulation and subtle presentation of notes, how to express each theme, motif, and figure with sostenuto, vibrato, and a lingering, beautiful sound.
Debussy is an impressionist composer. He might not depict a specific scene, but it would be nice if you could perform this imagining your own scene or landscape so vividly that it appears to the listener.