Ann Mariie For the information on whether the Luau's are offered as tours try the NCL web site. You can book on your own on any island the ship overnights on as well.
For the golf, go to the Cruisemates home page. Scroll all the way down to the bottom and on the left click on Ports of call. Once there, scrll down until you come to Hawaii.
Look for Kuki's feature article called Teeing off in Hawaii. Discusses golf on several islands.