Flooded rice paddy fields terraces in Bali (Indonesia)
the huts are just palm-leaf roofs. they are used to take a break in the shade (e.g. to eat lunch or have a nap), and to protect from the tropical rain.
For more information about Paddy Fields, read en.wikipedia.org/wiki/Paddy_field
For more information about Terrace Farming, read en.wikipedia.org/wiki/Terrace_(agriculture)