We are having our wedding at a park pavillion overlooking a pond. No idea on how to decorate.

This is the pavillion. (side view) it has a curved pathed area (where we are exchanging vows) in front of it overlooking a pond with a fountain and wooden arch bridge beyond that. I have tons of Christmas decorations left but not sure how to decorate it where it is elegant but yet simple. Any ideas would be gratefully appreciated.