The happy postman is smiling. He looks happy. He is passing out gifts to kids. He is delivering the mail in the snow because it is winter and Christmas time. The packages are for children, they are toys. The happy postman hears all kinds of laughing and singing, everyone is happy.
The postman is tired because he is very busy, but he keeps on smiling. After all of the deliveries, he is going to go and rest and go to bed. He is just happy that it is all done.