What a wonderful topic!
I mulled it over for the past few days and the following two ideas popped to the forefront.
This first photo is from our 2006 honeymoon to this wonderful lesbian-owned-and-operated resort, which itself embodies tranquility. It was taken in the literal backyard of the hotel. The town in the distance is Frederiksted.
I absolutely love the natural aspects of the Caribbean -- the weather, the water, the flowers and trees, the animals -- though the human behavior in the region (colonization, slavery, the resulting poverty/tourist economy) is less than tranquil.
And here is the most tranquil sight that we get around these parts:
He is clearly as peaceful as can be. And oh, the tranquility for the mommies!!