For anyone who wants to set up temporary housekeeping in Hawaii, houses in Kahala or in Waialae-Kahala, Aina Haina, Wailupe or Windward Oahu, near the beach or on it, rent from $250 to $1,200 a month. Summer, when many Hawaiians go to the mainland on their vacations, is the best time for renting. One way to find a house is to advertise in the newspapers: the Advertiser or the Star-Bulletin. Another is to write one of these Honolulu agents: Earl Thacker, 2400 Kalakaua Ave.; Louise Rogers, 2122 Kalakaua Ave.; the Bishop Trust Co., 141 South King St.; or the Hawaiian Trust Co., 1010 Richards St. There are hundreds of cooperative housekeeping apartments which can be rented from their absentee owners.