metaphor or simile for calm?

im writing a poem about a lake and i need a metaphor or simile to describe the calm feeling at a lake

how about the whispering water sings a quiet hymn of beauty?

you could say ” The lake is as calm as a leaf floating to the ground” or you could say ” the lake is as calm as a butterfly fluttering in the air” here are just a few but there are way more. Just think of calm things in the world and put them in to a simile useing like or as.

Try the word serene!