Joyful, appreciative, peaceful, wistful. Phrases "the most spiritual of all the flower people" and "I say down beside it and fairly cried for joy".
Within all of these phrases, Calypso clearly is in awe of nature. This is where he finds joy, and he appreciates it as we can see this by how thorough his descriptions are. He gives human characteristics to the flowers. Additionally, to say he cried for joy shows how the beauty from nature overcomes him in a flood of emotion thereby bringing peace.