(atmospheric thought) the calm night needs hoot owl creatures...

[idiomcritter]

or.... crickets?

[Maelstrom]

And tree frogs.  Daytime could use various song birds (boime dependent ideally), cicadas/insects as well.

[Garjouan]

I'd like to hear Loons. Especially in areas with lakes.
That being said: fog on lakes. I feel like it's foggy far too little.