"Hytter" would be just "cabins", "hytten" is "the cabin", but to say "the cabins" it's "hyttene".
"Hytte" is indefinite singular and "hytten" is definite singular.
Hytte is a small house used as a temporary lodging. They are usually found in the mountains, forests and by the sea, and used as private holiday houses. Lugar, on the other hand, is a private chamber or bedroom at sea.
Nowadays the "hytter" are not always that small either. They grow with the economy of the persons who own them.